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Found conflicts between different versions of "Microsoft.CSharp" that could not be resolved

Trying to Archive for Publishing our Xamarin.iOS app in Visual Studio on Mac but I get this error.
"Microsoft.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was chosen because it was primary and "Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was not.
References which depend on "Microsoft.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [/Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Microsoft.CSharp.dll].
/Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Microsoft.CSharp.dll
Project file item includes which caused reference "/Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/Microsoft.CSharp.dll".
Microsoft.CSharp
References which depend on "Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [].
/Users/user193748/Documents/repos/APP/APP/APP/bin/Release/netstandard2.0/APP.dll
Project file item includes which caused reference "/Users/user193748/Documents/repos/APP/APP/APP/bin/Release/netstandard2.0/APP.dll".
/Users/user193748/Documents/repos/APP/APP/APP/bin/Release/netstandard2.0/APP.dll
This has happened since I update Xamarin.Forms from 5.0.0.2196 to 5.0.0.2244. I tried to reverting the version and deploying but the same error occurs. I also tried going from .NET Standard 2.0 to 2.1. I've had the warning before and I was still able to Archive for Publishing. The app can be deployed on Visual Studio in Windows to the Android store but for some reason the iOS side of things is preventing it.

We had to update to a new MacInCloud server which had the latest iOS version (Monterey). This solved the issue.

asp.net Deleted Framework

Warning 28 The primary reference "MySql.Data, Version=8.0.11.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d, processorArchitecture=MSIL" could not be resolved because it has an indirect dependency on the assembly "Google.Protobuf, Version=3.5.1.0, Culture=neutral, PublicKeyToken=a7d26565bac4d604" which was built against the ".NETFramework,Version=v4.5" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v4.0". MMS
what's this error suppose to mean? plz help

Take a look at the current project properties, there is a target framework. You need to change it to 4.5 or above

Can I use FSharp.Data with .NET 4.0?

I have Visual Studio 2010 and .NET 4.0. When I try to use FSharp.Data.dll 2.0.9 in my C# project, it gives the warning:
The primary reference "FSharp.Data" could not be resolved because it
has an indirect dependency on the .NET Framework assembly
"FSharp.Core, Version=4.3.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a" which has a higher version "4.3.0.0"
than the version "4.0.0.0" in the current target framework.
Update:
I downloaded and added FSharp.Core version 4.3.0.0 dll to the project reference. It now has one more error message:
The primary reference "FSharp.Core, Version=4.3.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" could not
be resolved because it has a higher version "4.3.0.0" than exists in
the current target framework. The version found in the current target
framework is "4.0.0.0".

Microsoft.SqlServer.Smo issue

I have a .NET 2.0 project and I get the following error when I try to compile some projects that use SMO:
The primary reference "Microsoft.SqlServer.Smo, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91, processorArchitecture=MSIL" could not be resolved because it has an indirect dependency on the framework assembly "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0".
To resolve this problem, either remove the reference "Microsoft.SqlServer.Smo, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91, processorArchitecture=MSIL" or retarget your application to a framework version which contains "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089".
Can someone help. I don't want to move the projects to .NET 3.5 because of this.
Thanks

As the exceptions says the current reference assembly needs .NET 3.5. You must downgrade Microsoft.SqlServer.Smo which support .NET 2.0.

Problem using Managed C++ (.Net 2.0) in .Net 2.0 project in VS2010

I have two projects:
1) a project written in Visual C++ 2005 which targets the .net Framework 2.0.
2) a project in Visual C# 2010 that targets .net framework 2.0 and includes the C++ DLL.
When I build the C# project referencing the C++ assembly, I get errors like:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3258: The primary reference "ScannerWizard" could not be resolved because it has an indirect dependency on the .NET Framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the current target framework.
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3258: The primary reference "ScannerWizard" could not be resolved because it has an indirect dependency on the .NET Framework assembly "System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the current target framework.
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3258: The primary reference "ScannerWizard" could not be resolved because it has an indirect dependency on the .NET Framework assembly "System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the current target framework.
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3258: The primary reference "ScannerWizard" could not be resolved because it has an indirect dependency on the .NET Framework assembly "System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the current target framework.
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3258: The primary reference "ScannerWizard" could not be resolved because it has an indirect dependency on the .NET Framework assembly "System.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the current target framework.
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1360,9): warning MSB3258: The primary reference "ScannerWizard" could not be resolved because it has an indirect dependency on the .NET Framework assembly "System.Data.SqlXml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the current target framework.
If I make the project 4.0, it doesn't give those errors. Obviously, I shouldn't have to make it target 4.0 to use a 2.0 assembly.
Any idea on how I can fix this?

The C++ project was using the v100 Platform toolset. This makes it depend on 4.0 .NET versions of some libraries. Changing the toolset to v90 solves the problem. You may need to install the v90 toolset if you don't have them...