Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.0

[JohanLarsson]

When using Microsoft.CodeAnalysis.Common 2.9

System.IO.FileLoadException : Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
   at System.Threading.Tasks.ValueTask`1.get_IsCompleted()
   at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<BuildDeclarationCompilationFromScratchAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<BuildCompilationInfoFromScratchAsync>d__24.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetOrBuildCompilationInfoAsync>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetCompilationSlowAsync>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Gu.Roslyn.Asserts.Analyze.GetDiagnostics(DiagnosticAnalyzer analyzer, Solution solution)
   at Gu.Roslyn.Asserts.AnalyzerAssert.CodeFix(DiagnosticAnalyzer analyzer, CodeFixProvider fix, DiagnosticsAndSources diagnosticsAndSources, String fixedCode, IEnumerable`1 suppressedDiagnostics, IEnumerable`1 metadataReferences, String fixTitle, AllowCompilationErrors allowCompilationErrors)
   at Gu.Roslyn.Asserts.AnalyzerAssert.CodeFix[TAnalyzer,TCodeFix](String codeWithErrorsIndicated, String fixedCode, String fixTitle, AllowCompilationErrors allowCompilationErrors)
   at Gu.Roslyn.Asserts.Tests.WithMetadataReferencesAttribute.AnalyzerAssertTests.CodeFixSingleClassOneErrorCorrectFix()

[JohanLarsson]

For some reason pinning nuget System.Runtime.CompilerServices.Unsafe 4.5.1 solves the problem. Not sure why it is needed. From what I can see in the lock file latest version should be fine but no redirects are generated via <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>

[jarzab3]

Hi @JohanLarsson ,
I have a the same issue with this assembly System.Runtime.CompilerServices.Unsafe with different Version=4.0.4.1
When you said pinning nuget System.Runtime.CompilerServices.Unsafe 4.5.1 what do you mean by this?
Thank you

[JohanLarsson]

With pin I meant specifying an exact version of the nuget package. Looks like this using paket.

nuget Microsoft.CodeAnalysis.CSharp.Workspaces 2.3.1
nuget System.Collections.Immutable 1.3.1
nuget System.Reflection.Metadata 1.4.2
nuget Microsoft.Composition 1.0.31
nuget System.Runtime.CompilerServices.Unsafe 4.5.1

[SimonSDA]

I had the same issue as above with the Unity 5.9.3 NuGet package - it seems the version now includes this System.Runtime.CompilerServices.Unsafe assembly, but the version it installs has no version info specified in the DLL. @JohanLarsson 's answer sorted it for me (in my case I added the 4.5.2 version of the package).

[ENikS]

@JohanLarsson @SimonSDA

So, reading this thread I got confused. Should it be version 4.5.1 or latest >=4.5.2 is fine?

[JohanLarsson]

Depends on Roslyn version I think. I've been unpinning with latest. Unpinning as in using latest version of both.

Here is a test project that uses latest of both: https://github.com/DotNetAnalyzers/PropertyChangedAnalyzers

The analyzer library is pinned to

nuget Microsoft.CodeAnalysis.CSharp.Workspaces 2.3.1
nuget System.Collections.Immutable 1.3.1
nuget System.Reflection.Metadata 1.4.2
nuget Microsoft.Composition 1.0.31
nuget System.Runtime.CompilerServices.Unsafe 4.5.1

It is using paket if it looks unfamiliar. I don't use nuget.exe much so can't help with that.

[kpbaranwal]

Installing version 4.5.1 of System.Runtime.CompilerServices.Unsafe worked for me too. I downgraded from 4.5.2 where I was getting the same error.