VS Code Omnisharp.MsBuild.Projectmanager can not load assembly System.Numerics.Vectors 4.1.3.0

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I'm having a problem with opening a newly created blazorwasm project. Omnisharp will not start correctly. This is the output:

[warn]: OmniSharp.MSBuild.ProjectManager Failed to load project file 'c:\VS.NET2010\CoreApp\Server\CoreApp.Server.csproj'.
c:\VS.NET2010\CoreApp\Server\CoreApp.Server.csproj(1,1)
System.IO.FileLoadException: Kan bestand of assembly System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a of een van de afhankelijkheden hiervan niet laden. De manifestdefinitie van de gevonden assembly komt niet overeen met de assembly-verwijzing. (Uitzondering van HRESULT: 0x80131040)
Bestandsnaam: System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
   bij System.SpanHelpers.IndexOf(Char& searchSpace, Char value, Int32 length)
   bij Microsoft.Build.Evaluation.Expander`2.Function`1.ExtractPropertyFunction(String expressionFunction, IElementLocation elementLocation, Object propertyValue, UsedUninitializedProperties usedUnInitializedProperties, IFileSystem fileSystem)
   bij Microsoft.Build.Evaluation.Expander`2.PropertyExpander`1.ExpandPropertyBody(String propertyBody, Object propertyValue, IPropertyProvider`1 properties, ExpanderOptions options, IElementLocation elementLocation, UsedUninitializedProperties usedUninitializedProperties, IFileSystem fileSystem)
   bij Microsoft.Build.Evaluation.Expander`2.PropertyExpander`1.ExpandPropertiesLeaveTypedAndEscaped(String expression, IPropertyProvider`1 properties, ExpanderOptions options, IElementLocation elementLocation, UsedUninitializedProperties usedUninitializedProperties, IFileSystem fileSystem)
   bij Microsoft.Build.Evaluation.Expander`2.PropertyExpander`1.ExpandPropertiesLeaveEscaped(String expression, IPropertyProvider`1 properties, ExpanderOptions options, IElementLocation elementLocation, UsedUninitializedProperties usedUninitializedProperties, IFileSystem fileSystem)
   bij Microsoft.Build.Evaluation.Expander`2.ExpandIntoStringLeaveEscaped(String expression, ExpanderOptions options, IElementLocation elementLocation)
   bij Microsoft.Build.Evaluation.ToolsetReader.ExpandPropertyUnescaped(ToolsetPropertyDefinition property, Expander`2 expander)
   bij Microsoft.Build.Evaluation.ToolsetReader.EvaluateAndSetProperty(ToolsetPropertyDefinition property, PropertyDictionary`1 properties, PropertyDictionary`1 globalProperties, PropertyDictionary`1 initialProperties, Boolean accumulateProperties, String& toolsPath, String& binPath, Expander`2& expander)
   bij Microsoft.Build.Evaluation.ToolsetReader.ReadToolset(ToolsetPropertyDefinition toolsVersion, PropertyDictionary`1 globalProperties, PropertyDictionary`1 initialProperties, Boolean accumulateProperties)
   bij Microsoft.Build.Evaluation.ToolsetReader.ReadEachToolset(Dictionary`2 toolsets, PropertyDictionary`1 globalProperties, PropertyDictionary`1 initialProperties, Boolean accumulateProperties)
   bij Microsoft.Build.Evaluation.ToolsetReader.ReadToolsets(Dictionary`2 toolsets, PropertyDictionary`1 globalProperties, PropertyDictionary`1 initialProperties, Boolean accumulateProperties, String& msBuildOverrideTasksPath, String& defaultOverrideToolsVersion)
   bij Microsoft.Build.Evaluation.ToolsetReader.ReadAllToolsets(Dictionary`2 toolsets, ToolsetRegistryReader registryReader, ToolsetConfigurationReader configurationReader, PropertyDictionary`1 environmentProperties, PropertyDictionary`1 globalProperties, ToolsetDefinitionLocations locations)
   bij Microsoft.Build.Evaluation.ProjectCollection.InitializeToolsetCollection(ToolsetRegistryReader registryReader, ToolsetConfigurationReader configReader)
   bij Microsoft.Build.Evaluation.ProjectCollection..ctor(IDictionary`2 globalProperties, IEnumerable`1 loggers, IEnumerable`1 remoteLoggers, ToolsetDefinitionLocations toolsetDefinitionLocations, Int32 maxNodeCount, Boolean onlyLogCriticalEvents, Boolean loadProjectsReadOnly)
   bij Microsoft.Build.Evaluation.ProjectCollection..ctor(IDictionary`2 globalProperties)
   bij OmniSharp.MSBuild.ProjectLoader.EvaluateProjectFileCore(String filePath) in D:\a\1\s\src\OmniSharp.MSBuild\ProjectLoader.cs:regel 123
   bij OmniSharp.MSBuild.ProjectLoader.BuildProject(String filePath) in D:\a\1\s\src\OmniSharp.MSBuild\ProjectLoader.cs:regel 72
   bij OmniSharp.MSBuild.ProjectFile.ProjectFileInfo.Load(String filePath, ProjectIdInfo projectIdInfo, ProjectLoader loader, Guid sessionId, IDotNetCliService dotNetCli) in D:\a\1\s\src\OmniSharp.MSBuild\ProjectFile\ProjectFileInfo.cs:regel 113
   bij OmniSharp.MSBuild.ProjectManager.<>c__DisplayClass31_0.<LoadProject>b__0() in D:\a\1\s\src\OmniSharp.MSBuild\ProjectManager.cs:regel 302
   bij OmniSharp.MSBuild.ProjectManager.LoadOrReloadProject(String projectFilePath, Func`1 loader) in D:\a\1\s\src\OmniSharp.MSBuild\ProjectManager.cs:regel 313

WRSCH: registratie van assembly-bindingen is uitgeschakeld.
Als u assembly-bindingsfouten wilt registreren, stelt u de registerwaarde [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) in op 1.
Opmerking: er is een prestatiestraf gekoppeld aan de registratie van assembly-bindingsfouten.
Als u deze functie wilt uitschakelen, verwijdert u de registerwaarde [HKLM\Software\Microsoft\Fusion!EnableLog].

This is the csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="3.2.0" />
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\Client\CoreApp.Client.csproj" />
    <ProjectReference Include="..\Shared\CoreApp.Shared.csproj" />
  </ItemGroup>
</Project>

I have no clue why I get this error. Due to this I am not able to use IntelliSense in this project. A colleague of mine does not have this problem. He can create a similar project with the command: dotnet new blazorwasm -o CoreApp --hosted

On his PC the project opens just fine without any OmniSharp warning.

I do not ave a clue why I get this error on my PC.

Does anybody have an idea?

Thanks in advance!

omnisharp visual-studio-code csproj .net c#
2 Answers

The problem is that the included MSBuild in the C# for Visual Studio Code (powered by OmniSharp) VS Code Extension is not able to correctly locate the specific 4.1.3.0 version of System.Numerics.Vectors on the system.

The best solution is to just add the correct version of the DLL in

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Numerics.Vectors\v4.0_4.1.3.0__b03f5f7f11d50a3a

Another solution is to install .NET Core SDK 3.1.301 which contains that version of the System.Numerics.Vectors assembly and then copy

C:\Program Files\dotnet\sdk\3.1.301\Sdks\Microsoft.NET.Sdk.WindowsDesktop\tools\net472\System.Numerics.Vectors.dll

to

%USERPROFILE%\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin

This issue will probably be resolved in a later version of the C# for Visual Studio Code (powered by OmniSharp) VS Code Extension

user_95186980

You can add to runtime section of MSBuild.exe.config necessary version that installed in GAC.

      <dependentAssembly>
        <assemblyIdentity name="System.Numerics.Vectors" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.1.4.0" newVersion="4.1.4.0" />
      </dependentAssembly>
      <dependentAssembly>

To check version installed on your host:

gacutil.exe -l System.Numerics.Vectors

Usually gacutil located in SDK C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools\

user_31151290
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