languageserver crashes because of MethodError: no method matching Union{Int64, String}(::String)

[Gijs-Koot]

When starting the LanguageServer with lsp, the LanguageServer starts but eventually crashes with the following error appearing in julia-ls:stderr;

[ Info: Received new data from Julia Symbol Server.
ERROR: MethodError: no method matching Union{Int64, String}(::String)
Stacktrace:
 [1] LanguageServer.InitializeParams(::Dict{String,Any}) at /home/gijs/.julia/packages/LanguageServer/y1ebo/src/protocol/initialize.jl:111
 [2] dispatch_msg(::JSONRPC.JSONRPCEndpoint, ::JSONRPC.MsgDispatcher, ::Dict{String,Any}) at /home/gijs/.julia/packages/JSONRPC/1Kq3H/src/typed.jl:64
 [3] run(::LanguageServerInstance) at /home/gijs/.julia/packages/LanguageServer/y1ebo/src/languageserverinstance.jl:308
 [4] top-level scope at none:1

This is an issue that was filed at julia-vscode/LanguageServer.jl as well, more details there julia-vscode/LanguageServer.jl#651.

If I understand correctly, a fix has been merged here julia-vscode/LanguageServer.jl#821, but this isn't present in the latest release.

If I install the master branch directly, with

(@v1.5) pkg> add https://github.com/julia-vscode/LanguageServer.jl

the server starts without this error and appears to work well. This will eventually be resolved by a new release of LanguageServer.jl, but I thought to file this anyway for anyone using lsp-julia.

[ki-chi]

Do you use create_sysimage() in PackageCompiler.jl?

As the comment on the issue of julia-vscode/LanguageServer.jl#836, the error may be caused by precompiling LanguageServer with PackageCompiler.

Skipped the precompile, it works well on my environment. (LanguageServer v3.2.0 and Julia v1.5)

[Gijs-Koot]

The command issued to julia by this package doesn't include it, and I didn't consciously precompile it no. Also, I don't have PackageCompiler installed, so it seems unlikely that I'm using an image somewhere. The bug above does appear to explain it, and I'm just using master until the fix is merged. Thanks.

[danmrc]

Did this changed? I have the same issue, and I have not used PackageCompiler.jl

I can't use the add https://github.com/julia-vscode/LanguageServer.jl because it conflicts with some packages

Thanks in advance

[roiholtzman]

I also have this issue.

[gdkrmr]

should be solved now