not working with neovim lsp

[gasacchi]

when using fsautocomplete with neovim builtin lsp, lsp doesn't working

Client 1 quit with exit code 3 and signal 0 

my fsautocomplete:

require'lspconfig'.fsautocomplete.setup{}

when i try to run dotnet fsautocomplete --background-service-enabled give me error like:

[09:48:08.207 ERR] [Startup] Start - LSP mode crashed
System.IO.FileNotFoundException: Could not load file or assembly 'Fantomas.Client, Version=0.3.1.0, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.

File name: 'Fantomas.Client, Version=0.3.1.0, Culture=neutral, PublicKeyToken=null'
   at FsAutoComplete.Commands..ctor(FSharpCompilerServiceChecker checker, State state, BackgroundService backgroundService, Boolean hasAnalyzers, FSharpOption`1 rootPath)
   at FsAutoComplete.Lsp.FSharpLspServer..ctor(Boolean backgroundServiceEnabled, State state, FSharpLspClient lspClient) in /home/runner/work/FsAutoComplete/FsAutoComplete/src/FsAutoComplete/FsAutoComplete.Lsp.fs:line 183
   at FsAutoComplete.Lsp.startCore@2073-2.Invoke(FSharpLspClient lspClient) in /home/runner/work/FsAutoComplete/FsAutoComplete/src/FsAutoComplete/FsAutoComplete.Lsp.fs:line 2073
   at LanguageServerProtocol.Server.start[a,b](FSharpMap`2 requestHandlings, Stream input, Stream output, FSharpFunc`2 clientCreator, FSharpFunc`2 serverCreator) in /home/runner/work/FsAutoComplete/FsAutoComplete/src/LanguageServerProtocol/LanguageServerProtocol.fs:line 2782
   at FsAutoComplete.Lsp.startCore(Boolean backgroundServiceEnabled, ToolsPath toolsPath, FSharpFunc`2 workspaceLoaderFactory) in /home/runner/work/FsAutoComplete/FsAutoComplete/src/FsAutoComplete/FsAutoComplete.Lsp.fs:line 2073
   at FsAutoComplete.Lsp.start(Boolean backgroundServiceEnabled, ToolsPath toolsPath, FSharpFunc`2 workspaceLoaderFactory) in /home/runner/work/FsAutoComplete/FsAutoComplete/src/FsAutoComplete/FsAutoComplete.Lsp.fs:line 2079
~/Documents .NET v5.0.205 🎯 net5.0 

Dotnet version : 5.0.205
fsautocomplete: FsAutoComplete 0.48.1 (git sha da8f783)

[nojaf]

Your .NET version does look a bit old, I have 5.0.401 could you perhaps try and upgrade your SDK (if possible).

[baronfel]

This appears to be something wrong with the packaging of the dotnet tool version of fantomas. Ionide doesn't use this version of FSAC so it wasn't immediately apparent. If you look at the nuget package layout for 0.48.1, the Fantomas.Client dll isn't in the tools/net5.0/any folder as I'd expect it to be. We should investigate and fix this, then publish a new patch version of the dotnet tool.

[baronfel]

Taking a brief look, this is probably a transitive dependency issue. The Fantomas.Client dependency is a direct dependency of FsAutoComplete.Core, but only a transitive of FsAutoComplete, and we run dotnet pack on FsAutoComplete to make the tool which somehow drops this. This is a behavioral difference from dotnet publish, which does include the transitive dependencies. A quick fix would be to add a direct dependency to Fantomas.Client to the FsAutoComplete, but I'd rather learn what the differences are and align the two methods.

[baronfel]

This should be fixed in 0.48.2, which is being released now. Thank you for taking the time to report, I really want our vim/emacs/non-VSCode users to be happy with the experience overall :)