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NuGet Pack error: The default XML namespace of the project must be the MSBuild XML namespace

I am following the MS Instructions for preparing a NuGet Package on a .NET 4.7 Class Library I created with VS 2022. Unlike the .NET 6 Library, there are no project properties that facilitate building a NuGet package.
When I run the command nuget pack I get this error. Of course, if I look at the CSPROJ file, the namespace is on the Project element, so the error is not helpful.
Now, this differs from the other Q&A I found on StackExchange, because it occurs on the nuget pack command, so the other questions don't answer this one.
Does anyone know how to resolve this?
The CSPROJ file is here:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{6A38AC27-E82D-47CF-B1C6-D987D7BCAE0C}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>CodaRESTClient.NET</RootNamespace>
<AssemblyName>CodaRESTClient.NET</AssemblyName>
<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<Deterministic>true</Deterministic>
<NuGetPackageImportStamp>
</NuGetPackageImportStamp>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup>
<ApplicationIcon>Coda Logo - Image only.ico</ApplicationIcon>
</PropertyGroup>
<ItemGroup>
<Reference Include="Microsoft.Bcl.AsyncInterfaces, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Bcl.AsyncInterfaces.6.0.0\lib\net461\Microsoft.Bcl.AsyncInterfaces.dll</HintPath>
</Reference>
<Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>..\packages\Newtonsoft.Json.13.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
</Reference>
<Reference Include="RestSharp, Version=108.0.1.0, Culture=neutral, PublicKeyToken=598062e77f915f75, processorArchitecture=MSIL">
<HintPath>..\packages\RestSharp.108.0.1\lib\netstandard2.0\RestSharp.dll</HintPath>
</Reference>
<Reference Include="System" />
<Reference Include="System.Buffers, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Buffers.4.5.1\lib\net461\System.Buffers.dll</HintPath>
</Reference>
<Reference Include="System.Core" />
<Reference Include="System.Memory, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Memory.4.5.4\lib\net461\System.Memory.dll</HintPath>
</Reference>
<Reference Include="System.Numerics" />
<Reference Include="System.Numerics.Vectors, Version=4.1.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.Numerics.Vectors.4.5.0\lib\net46\System.Numerics.Vectors.dll</HintPath>
</Reference>
<Reference Include="System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.6.0.0\lib\net461\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
</Reference>
<Reference Include="System.Text.Encodings.Web, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Text.Encodings.Web.6.0.0\lib\net461\System.Text.Encodings.Web.dll</HintPath>
</Reference>
<Reference Include="System.Text.Json, Version=6.0.0.6, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Text.Json.6.0.6\lib\net461\System.Text.Json.dll</HintPath>
</Reference>
<Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
</Reference>
<Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
</Reference>
<Reference Include="System.Web" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Client.cs" />
<Compile Include="Client_Comment.cs" />
<Compile Include="Client_Discussion.cs" />
<Compile Include="Client_Errors.cs" />
<Compile Include="Client_Moderator.cs" />
<Compile Include="Client_Subscriptions.cs" />
<Compile Include="Client_Troubleshoot.cs" />
<Compile Include="Client_Vote.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="SerializableDictionary.cs" />
</ItemGroup>
<ItemGroup>
<None Include="app.config" />
<None Include="packages.config" />
</ItemGroup>
<ItemGroup>
<Content Include="Coda Logo - Image only.ico" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<Import Project="..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets" Condition="Exists('..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
<PropertyGroup>
<ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
</PropertyGroup>
<Error Condition="!Exists('..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets'))" />
</Target>
</Project>
... and the NUSPEC file:
<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
<metadata>
<id>$id$</id>
<version>$version$</version>
<title>$title$</title>
<authors>$author$</authors>
<owners>$author$</owners>
<licenseUrl>https://licenses.nuget.org/CATOSL-1.1</licenseUrl>
<projectUrl>https://github.com/info-tpr/CodaEA</projectUrl>
<iconUrl>https://www.codaea.io/images/CodaEA.png</iconUrl>
<requireLicenseAcceptance>false</requireLicenseAcceptance>
<description>$description$</description>
<releaseNotes>Summary of changes made in this release of the package.</releaseNotes>
<copyright>Copyright 2022, The Parallel Revolution LLC, All Rights Reserved</copyright>
<tags>error code analysis</tags>
</metadata>
</package>
The full error message from nuget command is:
nuget : The default XML namespace of the project must be the MSBuild XML namespace. If the project is authored in the MSBuild 2003 format, please add
xmlns="http://schemas.microsoft.com/developer/msbuild/2003" to the <Project> element. If the project has been authored in the old 1.0 or 1.2 format, please convert it to MSBuild 2003 format.
E:\Data\dotNetDev\codaea\CodaRESTServer\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets
At line:1 char:1
+ nuget pack
+ ~~~~~~~~~~
+ CategoryInfo : NotSpecified: (The default XML...xt.Json.targets:String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError

Error building project - unable to find assemblies in the package folder

I have loaded a solution developed in a older visual studio version in my local visual studio 2017. There are many reference to external dlls. When I compile the solution I get error as below despite the fact that the dll's are available under the "packages" folder in the solution. The target framework of the projects in the solution are set to .NET Framework 4. I have .NET Framework 4.7.1 installed in my computer. I would appreciate some help on this.
Updated with project file
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProductVersion>9.0.30729</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{D47A4044-AC8E-49F8-AD93-9D595F594C85}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>Biz</RootNamespace>
<AssemblyName>TakstNettBiz</AssemblyName>
<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<SccProjectName>SAK</SccProjectName>
<SccLocalPath>SAK</SccLocalPath>
<SccAuxPath>SAK</SccAuxPath>
<SccProvider>SAK</SccProvider>
<FileUpgradeFlags>
</FileUpgradeFlags>
<OldToolsVersion>3.5</OldToolsVersion>
<UpgradeBackupLocation />
<PublishUrl>publish\</PublishUrl>
<Install>true</Install>
<InstallFrom>Disk</InstallFrom>
<UpdateEnabled>false</UpdateEnabled>
<UpdateMode>Foreground</UpdateMode>
<UpdateInterval>7</UpdateInterval>
<UpdateIntervalUnits>Days</UpdateIntervalUnits>
<UpdatePeriodically>false</UpdatePeriodically>
<UpdateRequired>false</UpdateRequired>
<MapFileExtensions>true</MapFileExtensions>
<ApplicationRevision>0</ApplicationRevision>
<ApplicationVersion>1.0.0.%2a</ApplicationVersion>
<IsWebBootstrapper>false</IsWebBootstrapper>
<UseApplicationTrust>false</UseApplicationTrust>
<BootstrapperEnabled>true</BootstrapperEnabled>
<TargetFrameworkProfile />
<NuGetPackageImportStamp>
</NuGetPackageImportStamp>
</PropertyGroup>
<PropertyGroup>
<StyleCopEnabled>false</StyleCopEnabled>
<StyleCopTreatErrorsAsWarnings>false</StyleCopTreatErrorsAsWarnings>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
<CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
<CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'CIFastBuild|AnyCPU'">
<OutputPath>bin\CIFastBuild\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<DebugType>pdbonly</DebugType>
<PlatformTarget>AnyCPU</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
</PropertyGroup>
<ItemGroup>
<Reference Include="AutoMapper, Version=3.3.0.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\AutoMapper.3.3.0\lib\net40\AutoMapper.dll</HintPath>
</Reference>
<Reference Include="AutoMapper.Net4, Version=3.3.0.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\AutoMapper.3.3.0\lib\net40\AutoMapper.Net4.dll</HintPath>
</Reference>
<Reference Include="Castle.Core, Version=3.2.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\Castle.Core.3.2.2\lib\net40-client\Castle.Core.dll</HintPath>
</Reference>
<Reference Include="Common.Logging">
<HintPath>..\..\packages\Common.Logging.2.1.2\lib\net40\Common.Logging.dll</HintPath>
</Reference>
<Reference Include="EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\EntityFramework.6.0.2\lib\net40\EntityFramework.dll</HintPath>
</Reference>
<Reference Include="EntityFramework.SqlServer">
<HintPath>..\..\packages\EntityFramework.6.0.2\lib\net40\EntityFramework.SqlServer.dll</HintPath>
</Reference>
<Reference Include="FluentMigrator">
<HintPath>..\..\packages\FluentMigrator.1.4.0.0\lib\40\FluentMigrator.dll</HintPath>
</Reference>
<Reference Include="Magnum">
<HintPath>..\..\packages\Magnum.2.1.3\lib\NET40\Magnum.dll</HintPath>
</Reference>
<Reference Include="MassTransit">
<HintPath>..\..\packages\MassTransit.2.9.9\lib\net40\MassTransit.dll</HintPath>
</Reference>
<Reference Include="MassTransit.Transports.MSMQ">
<HintPath>..\..\packages\MassTransit.MSMQ.2.9.9\lib\net40\MassTransit.Transports.MSMQ.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Data.Edm, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\Microsoft.Data.Edm.5.2.0\lib\net40\Microsoft.Data.Edm.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Data.OData, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\Microsoft.Data.OData.5.2.0\lib\net40\Microsoft.Data.OData.dll</HintPath>
</Reference>
<Reference Include="Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\lib\Microsoft Windows Identity Foundation 3.5\Microsoft.IdentityModel.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.Web.Infrastructure.1.0.0.0\lib\net40\Microsoft.Web.Infrastructure.dll</HintPath>
</Reference>
<Reference Include="Microsoft.WindowsAzure.Configuration, Version=1.8.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.WindowsAzure.ConfigurationManager.1.8.0.0\lib\net35-full\Microsoft.WindowsAzure.Configuration.dll</HintPath>
</Reference>
<Reference Include="Microsoft.WindowsAzure.Storage, Version=2.1.0.3, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\WindowsAzure.Storage.2.1.0.3\lib\net40\Microsoft.WindowsAzure.Storage.dll</HintPath>
</Reference>
<Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\Newtonsoft.Json.6.0.6\lib\net40\Newtonsoft.Json.dll</HintPath>
</Reference>
<Reference Include="Ninject, Version=3.2.0.0, Culture=neutral, PublicKeyToken=c7192dc5380945e7, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\Ninject.3.2.2.0\lib\net40\Ninject.dll</HintPath>
</Reference>
<Reference Include="RestSharp">
<HintPath>..\..\packages\RestSharp.104.2.0\lib\net4\RestSharp.dll</HintPath>
</Reference>
<Reference Include="System" />
<Reference Include="System.ComponentModel.DataAnnotations" />
<Reference Include="System.configuration" />
<Reference Include="System.Core">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Data" />
<Reference Include="System.Data.Linq" />
<Reference Include="System.Data.Services.Client" />
<Reference Include="System.Drawing" />
<Reference Include="System.EnterpriseServices" />
<Reference Include="System.Runtime.Serialization">
<RequiredTargetFramework>3.0</RequiredTargetFramework>
</Reference>
<Reference Include="System.Security" />
<Reference Include="System.ServiceModel" />
<Reference Include="System.Spatial, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\..\packages\System.Spatial.5.2.0\lib\net40\System.Spatial.dll</HintPath>
</Reference>
<Reference Include="System.Transactions" />
<Reference Include="System.Web" />
<Reference Include="System.Web.DataVisualization" />
<Reference Include="System.Web.Extensions" />
<Reference Include="System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.Helpers.dll</HintPath>
</Reference>
<Reference Include="System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AspNet.Razor.2.0.30506.0\lib\net40\System.Web.Razor.dll</HintPath>
</Reference>
<Reference Include="System.Web.Services" />
<Reference Include="System.Web.WebPages, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.WebPages.dll</HintPath>
</Reference>
<Reference Include="System.Web.WebPages.Deployment, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.WebPages.Deployment.dll</HintPath>
</Reference>
<Reference Include="System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.WebPages.Razor.dll</HintPath>
</Reference>
<Reference Include="System.Xml" />
<Reference Include="System.Xml.Linq" />
<Reference Include="WebActivatorEx">
<HintPath>..\..\packages\WebActivatorEx.2.0.5\lib\net40\WebActivatorEx.dll</HintPath>
</Reference>
</ItemGroup>
<ItemGroup>

The issue is that the hintpath of your project did not point to the right dll path of your packages folder under the solution folder.
If the csproj exists under the proejct folder while the packages folder is on one above folder of the file, then the error happens.
You should change ..\..\ to ..\. Use the right path.
Or try this command under Tools-->Nuget Package Manager-->Package Manager Console
update-package -reinstall
to reinstall all the nuget packages.
Answer from the Customer
embarrassingly enough the whole issue was with the solution path where my solution was located in my local computer. I had a long path including a folder having two words as well. After trying everything else I moved the solution folder to C:\temp folder and the issue was no longer there. The error showed in VS was quite misleading. What a waist of time. Thank you for your efforts !

Embed Nuget dependencies in another nuget with PrivateAssets

I have a netstandard2.0 nugget package that has some dependencies:
<!-- Nugget Package dependencies -->
<ItemGroup>
<PackageReference Include="JetBrains.Annotations" Version="2020.1.0" PrivateAssets="All" />
<PackageReference Include="Serilog" Version="2.9.0" PrivateAssets="All" />
<PackageReference Include="Newtonsoft.Json" Version="12.0.3" PrivateAssets="All" />
<PackageReference Include="Newtonsoft.Json.Schema" Version="3.0.13" PrivateAssets="All" />
<PackageReference Include="Serilog.Enrichers.Thread" Version="3.1.0" PrivateAssets="All" />
<PackageReference Include="Serilog.Sinks.Async" Version="1.4.0" PrivateAssets="All" />
<PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" PrivateAssets="All" />
<PackageReference Include="Serilog.Sinks.File" Version="4.1.0" PrivateAssets="All" />
</ItemGroup>
Every time I install this package on a another project, it adds it's dependencies, like:
<ItemGroup>
<Reference Include="PackageXPTO, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\PackageXPTO.1.1.0\lib\netstandard2.0\PackageXPTO.dll</HintPath>
</Reference>
<Reference Include="JetBrains.Annotations, Version=2020.1.0.0, Culture=neutral, PublicKeyToken=1010a0d8d6380325, processorArchitecture=MSIL">
<HintPath>..\packages\PackageXPTO.1.1.0\lib\netstandard2.0\JetBrains.Annotations.dll</HintPath>
</Reference>
<Reference Include="Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>..\packages\PackageXPTO.1.1.0\lib\netstandard2.0\Newtonsoft.Json.dll</HintPath>
</Reference>
<Reference Include="Newtonsoft.Json.Schema, Version=3.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>..\packages\PackageXPTO.1.1.0\lib\netstandard2.0\Newtonsoft.Json.Schema.dll</HintPath>
</Reference>
<Reference Include="Serilog, Version=2.0.0.0, Culture=neutral, PublicKeyToken=24c2f752a8e58a10, processorArchitecture=MSIL">
<HintPath>..\packages\PackageXPTO.1.1.0\lib\netstandard2.0\Serilog.dll</HintPath>
</Reference>
<Reference Include="Serilog.Enrichers.Thread, Version=2.0.0.0, Culture=neutral, PublicKeyToken=24c2f752a8e58a10, processorArchitecture=MSIL">
<HintPath>..\packages\PackageXPTO.1.1.0\lib\netstandard2.0\Serilog.Enrichers.Thread.dll</HintPath>
</Reference>
(...)
This is messing with a project that I have that already depends on Newtonsoft.Json: the old dependency will now be related to the nugget and not a direct dependency: so, on the future, if this nugget no longer deppends on the Newtonsoft.Json, the dependency will be removed, but the project actually needs it.
Package configurations:
<PropertyGroup>
<AssemblyName>PackageXPTO</AssemblyName>
<RootNamespace>PackageXPTO</RootNamespace>
<TargetFramework>netstandard2.0</TargetFramework>
<Version>1.1.0</Version>
<SignAssembly>true</SignAssembly>
<AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
<AppxAutoIncrementPackageRevision>true</AppxAutoIncrementPackageRevision>
<CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
<GenerateAssemblyInfo>true</GenerateAssemblyInfo>
<LangVersion>7.2</LangVersion>
<PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
<GenerateDocumentationFile>true</GenerateDocumentationFile>
<GenerateAssemblyVersionAttribute>false</GenerateAssemblyVersionAttribute>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<TreatSpecificWarningsAsErrors />
<PublishRepositoryUrl>true</PublishRepositoryUrl>
<EmbedUntrackedSources>true</EmbedUntrackedSources>
<IncludeSymbols>true</IncludeSymbols>
<SymbolPackageFormat>snupkg</SymbolPackageFormat>
<TargetsForTfmSpecificBuildOutput>IncludeDependentDlls</TargetsForTfmSpecificBuildOutput>
</PropertyGroup>
Already tried to merge built .dll files, but didn't work
<!-- Auto bundler - used to apply package reference dll files -->
<!-- Include all .dll files under build directory, excluding the self one (to avoid errors) -->
<Target Name="IncludeDependentDlls" DependsOnTargets="ResolveReferences">
<ItemGroup>
<BuildOutputInPackage Include="$(OutputPath)\*.dll" Exclude="$(OutputPath)\$(AssemblyName).dll" />
</ItemGroup>
</Target>

"Program does not contain a static 'Main' method suitable for an try point - In solution with multiple projects

I been trying to split my current asp.net project across multiple projects following the layered architecture but after making some changes i'm not getting an error "Program does not contain a static 'Main' method suitable for an entry point in my domain layer project.
My program.cs with the main method is in my presentation layer project:
namespace AspNetCore.VueJs
{
public class Program
{
public static void Main(string[] args)
{
BuildWebHost(args).Run();
}
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.Build();
}
}
My csproj for domain layer project:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{85460453-E49C-4FE9-88E5-371A0880966C}</ProjectGuid>
<OutputType>Exe</OutputType>
<RootNamespace>Domain</RootNamespace>
<AssemblyName>Domain</AssemblyName>
<TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
<Deterministic>true</Deterministic>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<None Include="App.config" />
<None Include="packages.config" />
</ItemGroup>
<ItemGroup>
<Compile Include="Entities\ExampleEntity.cs" />
<Compile Include="Identity\ApplicationRole.cs" />
<Compile Include="Identity\ApplicationRoles.cs" />
<Compile Include="Identity\ApplicationUser.cs" />
<Compile Include="Identity\ApplicationUserLogin.cs" />
</ItemGroup>
<ItemGroup>
<Reference Include="Microsoft.AspNetCore.Authentication, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Authentication.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Authentication.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Authentication.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Authentication.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Authentication.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Authentication.Cookies, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Authentication.Cookies.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Authentication.Cookies.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Authentication.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Authentication.Core.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Authentication.Core.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Cryptography.Internal, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Cryptography.Internal.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Cryptography.Internal.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Cryptography.KeyDerivation, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Cryptography.KeyDerivation.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Cryptography.KeyDerivation.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.DataProtection, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.DataProtection.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.DataProtection.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.DataProtection.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.DataProtection.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.DataProtection.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Hosting.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Hosting.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Hosting.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Hosting.Server.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Hosting.Server.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Hosting.Server.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Http, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Http.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Http.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Http.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Http.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Http.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Http.Extensions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Http.Extensions.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Http.Extensions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Http.Features, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Http.Features.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Http.Features.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.Identity, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.Identity.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.Identity.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AspNetCore.WebUtilities, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.AspNetCore.WebUtilities.2.2.0\lib\netstandard2.0\Microsoft.AspNetCore.WebUtilities.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Configuration, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Configuration.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Configuration.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Configuration.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Configuration.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Configuration.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Configuration.Binder, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Configuration.Binder.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Configuration.Binder.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.DependencyInjection.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.Extensions.DependencyInjection.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.FileProviders.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.FileProviders.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.Extensions.FileProviders.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Hosting.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Hosting.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Hosting.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Identity.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Identity.Core.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Identity.Core.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Identity.Stores, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Identity.Stores.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Identity.Stores.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Logging, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Logging.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Logging.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Logging.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Logging.Abstractions.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Logging.Abstractions.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.ObjectPool, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.ObjectPool.2.2.0\lib\netstandard2.0\Microsoft.Extensions.ObjectPool.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Options, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Options.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Options.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.Primitives, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.Primitives.2.2.0\lib\netstandard2.0\Microsoft.Extensions.Primitives.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Extensions.WebEncoders, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Extensions.WebEncoders.2.2.0\lib\netstandard2.0\Microsoft.Extensions.WebEncoders.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Net.Http.Headers, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Net.Http.Headers.2.2.0\lib\netstandard2.0\Microsoft.Net.Http.Headers.dll</HintPath>
</Reference>
<Reference Include="Microsoft.Win32.Registry, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\Microsoft.Win32.Registry.4.5.0\lib\net461\Microsoft.Win32.Registry.dll</HintPath>
</Reference>
<Reference Include="System" />
<Reference Include="System.Buffers, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Buffers.4.5.0\lib\netstandard2.0\System.Buffers.dll</HintPath>
</Reference>
<Reference Include="System.ComponentModel.Annotations, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.ComponentModel.Annotations.4.5.0\lib\net461\System.ComponentModel.Annotations.dll</HintPath>
</Reference>
<Reference Include="System.ComponentModel.DataAnnotations" />
<Reference Include="System.Data" />
<Reference Include="System.Data.OracleClient" />
<Reference Include="System.Drawing" />
<Reference Include="System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Memory.4.5.1\lib\netstandard2.0\System.Memory.dll</HintPath>
</Reference>
<Reference Include="System.Net" />
<Reference Include="System.Numerics" />
<Reference Include="System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.Numerics.Vectors.4.4.0\lib\net46\System.Numerics.Vectors.dll</HintPath>
</Reference>
<Reference Include="System.Runtime.CompilerServices.Unsafe, Version=4.0.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.4.5.1\lib\netstandard2.0\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
</Reference>
<Reference Include="System.Security" />
<Reference Include="System.Security.AccessControl, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.Security.AccessControl.4.5.0\lib\net461\System.Security.AccessControl.dll</HintPath>
</Reference>
<Reference Include="System.Security.Cryptography.Xml, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Security.Cryptography.Xml.4.5.0\lib\net461\System.Security.Cryptography.Xml.dll</HintPath>
</Reference>
<Reference Include="System.Security.Permissions, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Security.Permissions.4.5.0\lib\net461\System.Security.Permissions.dll</HintPath>
</Reference>
<Reference Include="System.Security.Principal.Windows, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\packages\System.Security.Principal.Windows.4.5.0\lib\net461\System.Security.Principal.Windows.dll</HintPath>
</Reference>
<Reference Include="System.ServiceProcess" />
<Reference Include="System.Text.Encodings.Web, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.Text.Encodings.Web.4.5.0\lib\netstandard2.0\System.Text.Encodings.Web.dll</HintPath>
</Reference>
<Reference Include="System.Transactions" />
<Reference Include="System.Xml" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>
My startup project is set to my Api Project (The one with the main method).

Predefined type System.Object is not defined or imported

I'm having this weird error only in .cshtml files in VS 2015.
The error doesn't show up when I open the project with VS 2013.
Error CS0246 The type or namespace name 'System' could not be found
(are you missing a using directive or an assembly reference?)
here are my references:
<ItemGroup>
<Reference Include="Microsoft.CSharp" />
<Reference Include="Sitecore.Kernel, Version=7.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\Sitecore.Kernel.dll</HintPath>
</Reference>
<Reference Include="Sitecore.Mvc">
<HintPath>N:\XXX\Sitecore.Mvc.dll</HintPath>
</Reference>
<Reference Include="System.Web.DynamicData" />
<Reference Include="System.Web.Entity" />
<Reference Include="System.Web.ApplicationServices" />
<Reference Include="System.ComponentModel.DataAnnotations" />
<Reference Include="System" />
<Reference Include="System.Data" />
<Reference Include="System.Core" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="System.Web.Extensions" />
<Reference Include="System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\System.Web.Helpers.dll</HintPath>
</Reference>
<Reference Include="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\System.Web.Mvc.dll</HintPath>
</Reference>
<Reference Include="System.Web.Providers">
<HintPath>N:\XXX\System.Web.Providers.dll</HintPath>
</Reference>
<Reference Include="System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\System.Web.Razor.dll</HintPath>
</Reference>
<Reference Include="System.Web.WebPages, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\System.Web.WebPages.dll</HintPath>
</Reference>
<Reference Include="System.Web.WebPages.Deployment, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\System.Web.WebPages.Deployment.dll</HintPath>
</Reference>
<Reference Include="System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>N:\XXX\System.Web.WebPages.Razor.dll</HintPath>
</Reference>
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Drawing" />
<Reference Include="System.Web" />
<Reference Include="System.Xml" />
<Reference Include="System.Configuration" />
<Reference Include="System.Web.Services" />
<Reference Include="System.EnterpriseServices" />
What might be the cause of this?
Please refer to this question that I created as well. It's the same issue: The type or namespace name 'System' could not be found

This is a problem in both VS 2013 and VS 2015. Build output must be set to the default build path in order for Razor intellisense to work in .cshtml files. See this excellent article reproducing the issue and discussing alternatives. http://www.dennisonpro.info/managing-intellisense-in-razor-views-with-mvc-5-using-custom-builds-in-visual-studio-2013/
So the build path must be set to bin\ for MVC projects. If you need your output to go somewehere else, you must create a post-build step that copies the files from bin\ to another location.

I had a lot of CSHTML Intellisense issues with MVC 4 in VS 2015 and opted just to upgrade to MVC 5. However, MVC 4 should still work, just not perfectly, according to: Does Visual Studio 2015 support older versions of MVC?.

Deleting bin and obj folders in all projects of that solution worked for me.
Seems like those were having old files generated by some older version of visual studio, which are not compatible with new version of visual studio.

Managed the issue.. I had the build path set to a "c:...\bin" instead of "\bin". I believe this happened because I don't have any web.config in the root of the project, so VS didn't identify my project as a web project. After I changed the build root and reloaded the project, the errors were gone and intellisense appeared.

Add the reference to the System assembly in the project references:
right click on references -> add reference -> assemblies -> Framework -> System