I have started a new Web Application in Visual Studio 2019. I have added a Web Api. Shortly after or at the same time (can't remember), I startet getting warnings like this:
Warning No way to resolve conflict between "Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" and "Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed". Choosing "Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" arbitrarily.
I noticed but did not do anything as I decided to wait until it gave me problems.
And that is now...
I am about to use a JSon object but when writing this:
JObject jObject = JObject.Parse(result);
The compiler gives me this error:
Error CS0433 The type 'JObject' exists in both 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' and 'Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'
I have searched the web and my conclusions are as follows:
It looks like it is Microsoft.AspNet.WebApi.Client that is the only package installed, that has a dependency on Newtonsoft.Json (>= 6.0.4)
I have installed Newtonsoft.Json (12.0.3)
In Solution Explorer. In reference list, I have only 1 reference. And that is the one for 12.0.3.
In Web.Config I have this entry (and only this for Newtonsoft.Json).
<dependentAssembly><assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/><bindingRedirect oldVersion="0.0.0.0-12.0.0.0" newVersion="12.0.0.0"/></dependentAssembly>
In my .csproj I can see 3 different references in 3 different ItemGroups:
One for v. 12.0.0.0
One for v. 12.0.2
And one for v. 12.0.3
I tried to uninstall package Newtonsoft.Json, but is not allowed as other packages are dependent on this.
I have runned this command: Update-Package Newtonsoft.Json in the Package Manager Console, which told me, that no new updates were available.
And now, I have runned out of ideas. I am stucked. Anyone knows what to do?
****New update****
I found the 6.0.0.0. Please have a look at the picture:
Here in resources I double clicked the Newtonsoft.Json reference and in the object browser I can see both 6.0.0.0 and 12.0.0.0.
As you can see, both 6.0.0.0 and 12.0.0.0 are present. 6.0.0.0 is somewhere on my C:-drive inside a SDK.
I have tried to delete the file. My project got nuts. Then I replaced that file with the 12.0.0.0 from my project. This gave me the error that assemplies did not match.
I finally copied the old .dll back. And is a bit stucked again.
Any ideas?
Okay, I fixed it.
I had 2 references in my .csproj file to Newtonsoft.Json. One pointed at packages......\xxx.12.0.3 and one pointing at packages......\xxx.12.0.2.
Both of them was above 6.0.0.0 which was the error I got. So I ignored them.
But acutally, in my project I had only 12.0.3 folder and no 12.0.2 folder. So the reference did not work and VS tried to find another place to look.
I guess it looks around, maybe using the GAC but finally it ended up deep down my local drive in one Azure SDK and found Newtonsoft.Json 6.0.0.0. And that was the problem.
I removed the 12.0.2 reference from my .csproj and finally it worked.
The issue usually comes from two different projects that use different versions of the same library.
Both of those projects are then referenced to another one and the warning effectively warns you that something like this might happen.
Go to the solution and right click - manage nuget packages.
Go to the consolidate tab. Check that newtonsoft is there. If it is, install the same package to all projects.
If that doesn't work, check your projects for added references that don't come from a nuget and remove those too.
In my case, I had to edit the .csproj and look for Newton references. I found out that Antlr3 had a HintPath to an old version. Even the package not existing.
I was working on a project to Self host a Web API project.
There are two packages 1) Microsoft.AspNet.WebAPi.SelfHost
2) Microsoft.AspNet.WebApi. I had run into a problem where two different versions of NewtonSoft.Json had been installed by the above packages and it showed a compile-time warning as well as a run time exception. If I install Microsoft.AspNet.WebAPi.SelfHost before Microsoft.AspNet.WebApi then Newtonsoft.Json version 6.0.0.0. is installed by the former and the version 11.0.0.0 by the later which gives the error. but if I install Microsoft.AspNet.WebApi, then version 11.0.0.0 is installed and Microsoft.AspNet.WebAPi.SelfHost doesn't install Newtonsoft.Json but I still get the following error
"Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its >dependencies. The located assembly's manifest definition >does not match the assembly reference. (Exception from >HRESULT: 0x80131040)/nSystem.IO.FileLoadException"
although the following is the entry in my web.config reference
"culture="neutral" publicKeyToken="30ad4fe6b2a6aeed"
bindingRedirect oldVersion="0.0.0.0-11.0.0.0" newVersion="11.0.0.0" />"
I am really not getting why it is referring to version 6.0.0.0 when a newer version is installed. And if I need both the versions how do I refer to each without causing compiler issues.
Edit: Another thing to mention here is that it errors only after publishing the file but if I run it in release mode, no issue is occurring.
I have tried this after creating a new folder from scratch.
Edit: I have also tried checking the GAC. Newtonsoft.JSON is not available in the GAC. Can anyone tell how to check the manifest/config file of a third-party package like the Microsoft.AspNet.WebAPi.SelfHost
Edit: I also checked the solutions from the linked thread, but it didn't help.
Edit: I just now edited Microsoft.Owin from version 2.0.2 to version 4, but strangely after publishing and running it is still referring to version 2. I checked web.config and package.config, they have correct assembly redirects as well as correct package. So i guess there is some other place where it is not getting updated. Anyone can help me on this?
I've been trying to use the most recent version of DiffSharp (v0.7.7) with C#. I keep getting the following error:
Error 3 Assembly 'DiffSharp, Version=0.7.7.0, Culture=neutral,
PublicKeyToken=null' uses 'FSharp.Core, Version=4.4.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher
version than referenced assembly 'FSharp.Core, Version=4.3.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
It seems to be looking for FSharp.Core Version 4.4.0.0. As far as I'm aware - no such thing exists. Or am I wrong? I'm using Visual Studio 2012 on Windows 10 and have updated absolutely everything I could think of. My .Net build is 4.6.1.
I tried doing this fix also mentioned in Stack Overflow: Could not load file or assembly FSharp.Core, Version=4.0.0.0 Azure Web Role
but it didn't yield anything.
Has anyone had similar experiences like this?
Any thoughts/ideas/solutions would be greatly appreciated.
Ran in to the same problem with diffSharp and C#.
I solved issue by adding the FSharep.core nuget packet to project.
Install-Package FSharp.Core -Version 4.7.0
Although I have no explanation for why the FSharp.Core version 4.4.0 package is no longer available, I have found that the later 4.5.0 package (which is available as of Jan 2021) worked for me.
I'm looking at adding the reference;
Microsoft.Reporting.WinForms
to my VisualStudio (2015) project but when I go to Add the Reference in the Solution Explorer I couldn't find it.
Eventually I added it through NuGet but now I am getting the error message;
Could not load file or assembly 'Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
which leads me to believe I just haven't added the package properly. I've installed Microsoft SQL Server Data Tools through program features but still no luck.
What am I missing?
You can try by executing this into Package Manager Console
Install-Package Microsoft.Reporting.WinForms.v11
I have this exception generated on some user machines (~1 of 20):
Could not load file or assembly 'System, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its
dependencies. The system cannot find the file specified.
I found several references to this error over the web and this site but nothing helped.
I have an add-in application which uses WCF to connect to the server. The add-in built with .NET Framework 3.5 with VS 2008.
The error is reproducible on one of the test machines in only one user account. I install my application and can only reproduce this from one account on this machine everywhere else it is working fine. Furthermore it is only reproducible with only one version of host application which I created add-in for (I assume because it uses differnet .NET Frameworks).
I have checked the fuse logs and I see the following:
Assembly manager loaded from: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\mscorwks.dll
Running under executable C:\Program Files\SolidWorks Corp\SolidWorks\sldworks.exe
--- A detailed error log follows.
=== Pre-bind state information ===
LOG: User = Home\User
LOG: DisplayName = System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
(Fully-specified)
LOG: Appbase = file:///C:/Program Files/SolidWorks Corp/SolidWorks/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = NULL
Calling assembly : System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.
So by some reasons it is trying to use v2.0.50727\mscorwks.dll loader to load the Version=4.0.0.0 of System.dll. On build machine I'm referring 2.0.0.0 version of System.dll.
I had this same problem - some users could pull from git and everything ran fine. Some would pull and get a very similar exception:
Could not load file or assembly '..., Version=..., Culture=neutral, PublicKeyToken=...' or one of its dependencies. The system cannot find the file specified.
In my particular case it was AjaxMin, so the actual error looked like this but the details don't matter:
Could not load file or assembly 'AjaxMin, Version=4.95.4924.12383, Culture=neutral, PublicKeyToken=21ef50ce11b5d80f' or one of its dependencies. The system cannot find the file specified.
It turned out to be a result of the following actions on a Solution:
NuGet Package Restore was turned on for the Solution.
A Project was added, and a Nuget package was installed into it (AjaxMin in this case).
The Project was moved to different folder in the Solution.
The Nuget package was updated to a newer version.
And slowly but surely this bug started showing up for some users.
The reason was the Solution-level packages/respositories.config kept the old Project reference, and now had a new, second entry for the moved Project. In other words it had this before the reorg:
<repository path="..\Old\packages.config" />
And this after the reorg:
<repository path="..\Old\packages.config" />
<repository path="..\New\packages.config" />
So the first line now refers to a Project that, while on disk, is no longer part of my Solution.
With Nuget Package Restore on, both packages.config files were being read, which each pointed to their own list of Nuget packages and package versions. Until a Nuget package was updated to a newer version however, there weren't any conflicts.
Once a Nuget package was updated, however, only active Projects had their repositories listings updated. NuGet Package Restore chose to download just one version of the library - the first one it encountered in repositories.config, which was the older one. The compiler and IDE proceeded as though it chose the newer one. The result was a run-time exception saying the DLL was missing.
The answer obviously is to delete any lines from this file that referenced Projects that aren't in your Solution.
I got this after downgrading a project from .net 4.5 to .net 3.5.
To resolve I had to go in to the project - properties - settings window and delete all my settings, save the project, exit and restart visual studio, go back into project - properties -settings window and re-enter all my settings and their default values
This worked for me.
Go to Project->Propertied->Target Frawork->Change frame work like 3.5 to 4.0
I had the problem under Linux and I needed to install those. I don't know which one actually fixed the problem, but that error was gone after that:
apt-get install mono-utils mono-runtime-sgen mono-runtime-common \
mono-runtime-boehm mono-runtime-dbg mono-xbuild
I've seen this a couple times, and it is usually fixed by running a repair on .NET Framework (whichever version the application is trying to use).
You are using .net 4? - Maybe on the clients there is only the ".net framework 4 client profile" installed. Try to install full package!!
Download here
In my case, I was able to find issue with ScriptManager by setting Debug=true in web.config file
I answered too late but it has worked in my case.If you are facing this issue in your project please add the following line in your web.config :
<compilation batch="false" >
This worked in my case. If you already have compilation tag in your web.config then add only batch="false" property to it.
You can enable NuGet packages and update you dlls. so that it work.
or you can update the package manually by going through the package manager in your vs if u know which version you require for your solution.
Even I have experience some more strange things, I can see there is no dll in GAC from where the dll is loading but windows > Module shows system.dll version=4.0.0.0 loaded
i just changed my target .net framework and it worked .in my case i changed from .net 4.7 to .net 4.
Right click your solution and select properties
selct properties
Click Application >> Target Framework
FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=7.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified.
this is my problem. I installed system.configuration assembly in the project and other class libraries also. now the problem has gone.
am used net 6.0 with aspcore.report and problem like this happened with me
I installed system.configuration assembly in the server project problem solved