csharp-ls: could not OpenProjectAsync

I use neovim with csharp-ls and it suddenly stopped working. I really don’t understand why.

Every time I startup the lsp I get an error on startup.

LSP[csharp_ls][Info] csharp-ls: initializing, csharp-ls version 0.4.0.0; options are: {
  "logLevel": 4
}
LSP[csharp_ls][Info] csharp-ls: csharp-ls is released under MIT license and is not affiliated with Microsoft Corp.; see https://github.com/razzmatazz/csharp-language-server
LSP[csharp_ls][Log] csharp-ls: attempting to find and load solution based on cwd: "/home/nikolai/repos/astar_maze"..
LSP[csharp_ls][Log] csharp-ls: looking for .csproj/fsproj files on /home/nikolai/repos/astar_maze..
LSP[csharp_ls][Log] csharp-ls: 0 solution(s) found: []
LSP[csharp_ls][Log] csharp-ls: no or multiple .sln files found on /home/nikolai/repos/astar_maze
LSP[csharp_ls][Log] csharp-ls: loading proj file /home/nikolai/repos/astar_maze/AStarMaze.csproj..
LSP[csharp_ls][Log] csharp-ls: could not OpenProjectAsync('/home/nikolai/repos/astar_maze/AStarMaze.csproj'): System.AggregateException: One or more errors occurred. (Could not load file or assembly 'System.Conf
iguration.ConfigurationManager, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. Could not find or load a specific file. (0x80131621))
 ---> System.IO.FileLoadException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. Could not find or load a specifi
c file. (0x80131621)
File name: 'System.Configuration.ConfigurationManager, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
 ---> System.IO.FileLoadException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromPath(IntPtr ptrNativeAssemblyLoadContext, String ilPath, String niPath, ObjectHandleOnStack retAssembly)
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String assemblyPath)
   at System.Reflection.Assembly.LoadFrom(String assemblyFile)
   at Microsoft.Build.Locator.MSBuildLocator.<>c__DisplayClass15_0.<RegisterMSBuildPath>g__TryLoadAssembly|3(AssemblyName assemblyName)
   at Microsoft.Build.Locator.MSBuildLocator.<>c__DisplayClass15_0.<RegisterMSBuildPath>b__2(AssemblyLoadContext _, AssemblyName assemblyName)
   at System.Runtime.Loader.AssemblyLoadContext.GetFirstResolvedAssemblyFromResolvingEvent(AssemblyName assemblyName)
   at System.Runtime.Loader.AssemblyLoadContext.ResolveUsingEvent(AssemblyName assemblyName)
   at System.Runtime.Loader.AssemblyLoadContext.ResolveUsingResolvingEvent(IntPtr gchManagedAssemblyLoadContext, AssemblyName assemblyName)
   at Microsoft.Build.Evaluation.ToolsetReader.ReadAllToolsets(Dictionary`2 toolsets, ToolsetConfigurationReader configurationReader, PropertyDictionary`1 environmentProperties, PropertyDictionary`1 globalProper
ties, ToolsetDefinitionLocations locations)
   at Microsoft.Build.Evaluation.ProjectCollection.InitializeToolsetCollection(ToolsetConfigurationReader configReader)
   at Microsoft.Build.Evaluation.ProjectCollection..ctor(IDictionary`2 globalProperties, IEnumerable`1 loggers, IEnumerable`1 remoteLoggers, ToolsetDefinitionLocations toolsetDefinitionLocations, Int32 maxNodeCo
unt, Boolean onlyLogCriticalEvents, Boolean loadProjectsReadOnly, Boolean useAsynchronousLogging)
   at Microsoft.Build.Evaluation.ProjectCollection..ctor(IDictionary`2 globalProperties)
   at Microsoft.CodeAnalysis.MSBuild.Build.ProjectBuildManager.StartBatchBuild(IDictionary`2 globalProperties)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildProjectLoader.Worker.LoadAsync(CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildProjectLoader.LoadProjectInfoAsync(String projectFilePath, ProjectMap projectMap, IProgress`1 progress, ILogger msbuildLogger, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.OpenProjectAsync(String projectFilePath, ILogger msbuildLogger, IProgress`1 progress, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
LSP[csharp_ls][Log] csharp-ls: OK, 1 project files loaded

Non of the lsp commands work

I found https://github.com/emacs-lsp/lsp-mode/issues/3198 and https://github.com/razzmatazz/csharp-language-server/issues/3

But I feel the issue should be fixed after those issues

I am on the latest version of csharp-ls

I am on the correct version of dotnet (6) Like I said it suddenly stopped working (I probably did a sudo apt upgrade)

I feel like I am missing something obvious but I cannot seem to find the issue here

[razzmatazz]

I have released a new version on nuget which should fix this issue:

• https://www.nuget.org/packages/csharp-ls/0.5.6

[nikolightsaber]

I compiled from source again and it seems to work fine.

Might I suggest a build from source section in the README I used:

dotnet build, but with that you need all the dll’s

For one package I used:

dotnet publish -r linux-x64 -p:PublishSingleFile=true -p:UseAppHost=true --self-contained false

This project works really good as an LSP for me. For work we have a huge project with the whole range of Microsoft Targets, From NET 5.0 to .NET standard 2.0 to windows only .NET Framework 4.6.1. Almost all LSP actions across projects work and inside a single file everything always works in Linux with neovim.

Thanks again for the help 😄