# VSCode language server won't start

**URL:** <https://discourse.julialang.org/t/vscode-language-server-wont-start/64325>\
**Category:** VS Code\
**Tags:** question\
**Created:** [July 9, 2021, 7:36am UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325 "2021-07-09T07:36:27Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Impressium](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/impressium/32/19575_2.png) [@Impressium](https://discourse.julialang.org/u/Impressium)\
**Post date:** [July 9, 2021, 7:36am UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325/1 "2021-07-09T07:36:27Z")

</div>

Hi all 🙂

The VSCode language server won’t start for me. I’m using Windows 10, julia-1.7.0-beta3, VSCode-1.58 and VSCode extention juliainsider-1.3.13. I get the following error

```julia
┌ Error: Some Julia code in the VS Code extension crashed
└ @ Main c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\error_handler.jl:15
ERROR: MethodError: no method matching isinmanifest(::Pkg.Types.Manifest, ::Base.UUID)
Closest candidates are:
  isinmanifest(!Matched::Pkg.Types.Context, ::Base.UUID) at c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\utils.jl:95
  isinmanifest(!Matched::Dict{Base.UUID, Pkg.Types.PackageEntry}, ::Base.UUID) at c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\utils.jl:96
Stacktrace:
 [1] load_package_from_cache_into_store!(ssi::SymbolServerInstance, uuid::Base.UUID, manifest::Pkg.Types.Manifest, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:169
 [2] load_project_packages_into_store!(ssi::SymbolServerInstance, environment_path::String, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:159
 [3] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::LanguageServer.var"#93#95"{LanguageServerInstance}, error_handler::var"#3#4"; download::Bool)
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:117
 [4] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::Function, error_handler::Function)
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:27
 [5] macro expansion
   @ c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\LanguageServer\src\languageserverinstance.jl:176 [inlined]
 [6] (::LanguageServer.var"#92#94"{LanguageServerInstance})()
   @ LanguageServer .\task.jl:411
[Info - 12:28:14 AM] Connection to server got closed. Server will restart.
┌ Error: Some Julia code in the VS Code extension crashed
└ @ Main c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\error_handler.jl:15
ERROR: MethodError: no method matching isinmanifest(::Pkg.Types.Manifest, ::Base.UUID)
Closest candidates are:
  isinmanifest(!Matched::Pkg.Types.Context, ::Base.UUID) at c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\utils.jl:95
  isinmanifest(!Matched::Dict{Base.UUID, Pkg.Types.PackageEntry}, ::Base.UUID) at c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\utils.jl:96
Stacktrace:
 [1] load_package_from_cache_into_store!(ssi::SymbolServerInstance, uuid::Base.UUID, manifest::Pkg.Types.Manifest, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:169
 [2] load_project_packages_into_store!(ssi::SymbolServerInstance, environment_path::String, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:159
 [3] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::LanguageServer.var"#93#95"{LanguageServerInstance}, error_handler::var"#3#4"; download::Bool)
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:117
 [4] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::Function, error_handler::Function)
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:27
 [5] macro expansion
   @ c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\LanguageServer\src\languageserverinstance.jl:176 [inlined]
 [6] (::LanguageServer.var"#92#94"{LanguageServerInstance})()
   @ LanguageServer .\task.jl:411
[Info - 12:28:37 AM] Connection to server got closed. Server will restart.
┌ Error: Some Julia code in the VS Code extension crashed
└ @ Main c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\error_handler.jl:15
ERROR: MethodError: no method matching isinmanifest(::Pkg.Types.Manifest, ::Base.UUID)
Closest candidates are:
  isinmanifest(!Matched::Pkg.Types.Context, ::Base.UUID) at c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\utils.jl:95
  isinmanifest(!Matched::Dict{Base.UUID, Pkg.Types.PackageEntry}, ::Base.UUID) at c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\utils.jl:96
Stacktrace:
 [1] load_package_from_cache_into_store!(ssi::SymbolServerInstance, uuid::Base.UUID, manifest::Pkg.Types.Manifest, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:169
 [2] load_project_packages_into_store!(ssi::SymbolServerInstance, environment_path::String, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:159
 [3] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::LanguageServer.var"#93#95"{LanguageServerInstance}, error_handler::var"#3#4"; download::Bool)
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:117
 [4] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::Function, error_handler::Function)
   @ SymbolServer c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\SymbolServer\src\SymbolServer.jl:27
 [5] macro expansion
   @ c:\Users\<user>\.vscode\extensions\julialang.language-julia-insider-1.3.13\scripts\packages\LanguageServer\src\languageserverinstance.jl:176 [inlined]
 [6] (::LanguageServer.var"#92#94"{LanguageServerInstance})()
   @ LanguageServer .\task.jl:411
[Error - 12:29:01 AM] Connection to server got closed. Server will not be restarted.

```

---

<div class="post-metadata">

**Author:** ![pfitzseb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pfitzseb/32/45566_2.png) [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)\
**Post date:** [July 9, 2021, 7:37am UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325/2 "2021-07-09T07:37:03Z")

</div>

We don’t support 1.7 yet.

---

<div class="post-metadata">

**Author:** ![Impressium](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/impressium/32/19575_2.png) [@Impressium](https://discourse.julialang.org/u/Impressium)\
**Post date:** [July 9, 2021, 7:45am UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325/3 "2021-07-09T07:45:28Z")

</div>

Oh ty!

---

<div class="post-metadata">

**Author:** ![mmaeusezahl](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mmaeusezahl/32/18325_2.png) [@mmaeusezahl](https://discourse.julialang.org/u/mmaeusezahl)\
**Post date:** [July 17, 2021, 3:41pm UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325/4 "2021-07-17T15:41:19Z")

</div>

Hi,

not trying to necropost, but I don’t think this problem is limited to 1.7.  
I just freshly installed julia 1.6.2 (didn’t even notive the new patch release unitl language server didn’t start) with the current stable releases of VSCode (1.85.2) and the Julia Extension (1.2.7). Julia outputs:

```julia-repl
julia> versioninfo()
Julia Version 1.6.2
Commit 1b93d53fc4 (2021-07-14 15:36 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)      
  CPU: Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, broadwell)
Environment:
  JULIA_EDITOR = code
  JULIA_NUM_THREADS = 4

```

And the language server extension also crashes:

```julia
[ Info: Starting the Julia Language Server
[ Info: Symbol server store is at 'c:\Users\Max\AppData\Roaming\Code\User\globalStorage\julialang.language-julia\symbolstorev5'.
┌ Error: Some Julia code in the VS Code extension crashed
└ @ Main c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\error_handler.jl:15
ERROR: MethodError: no method matching isinmanifest(::Pkg.Types.Manifest, ::Base.UUID)
Closest candidates are:
  isinmanifest(!Matched::Pkg.Types.Context, ::Base.UUID) at c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\SymbolServer\src\utils.jl:95
  isinmanifest(!Matched::Dict{Base.UUID, Pkg.Types.PackageEntry}, ::Base.UUID) at c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\SymbolServer\src\utils.jl:96
Stacktrace:
 [1] load_package_from_cache_into_store!(ssi::SymbolServerInstance, uuid::Base.UUID, manifest::Pkg.Types.Manifest, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\SymbolServer\src\SymbolServer.jl:169
 [2] load_project_packages_into_store!(ssi::SymbolServerInstance, environment_path::String, store::Dict{Symbol, SymbolServer.ModuleStore})
   @ SymbolServer c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\SymbolServer\src\SymbolServer.jl:159
 [3] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::LanguageServer.var"#93#95"{LanguageServerInstance}, error_handler::var"#3#4"; download::Bool)
   @ SymbolServer c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\SymbolServer\src\SymbolServer.jl:117
 [4] getstore(ssi::SymbolServerInstance, environment_path::String, progress_callback::Function, error_handler::Function)
   @ SymbolServer c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\SymbolServer\src\SymbolServer.jl:27
 [5] macro expansion
   @ c:\Users\Max\.vscode\extensions\julialang.language-julia-1.2.7\scripts\packages\LanguageServer\src\languageserverinstance.jl:176 [inlined]
 [6] (::LanguageServer.var"#92#94"{LanguageServerInstance})()
   @ LanguageServer .\task.jl:411
[Info - 17:16:01] Connection to server got closed. Server will restart.

```

From my end this look like this was introduced by [this PR](https://github.com/JuliaLang/Pkg.jl/pull/2561) where a stricter type enforcement for the Manifest was introduced in Pkg.jl. Before it used `const Manifest = Dict{UUID,PackageEntry}` but now has a new type simply called `Manifest`. This was then backported into 1.6.2 [here](https://github.com/JuliaLang/Pkg.jl/pull/2592) I guess.

I think going back to julia 1.6.1 would solve this issue for now.

---

<div class="post-metadata">

**Author:** ![ianshmean](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ianshmean/32/216042_2.png) [@ianshmean](https://discourse.julialang.org/u/ianshmean)\
**Post date:** [July 18, 2021, 6:23am UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325/5 "2021-07-18T06:23:07Z")

</div>

This should be fixed now in the latest vscode julia extension build, for 1.6.2 and up

---

<div class="post-metadata">

**Author:** ![mmaeusezahl](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mmaeusezahl/32/18325_2.png) [@mmaeusezahl](https://discourse.julialang.org/u/mmaeusezahl)\
**Post date:** [July 18, 2021, 12:47pm UTC](https://discourse.julialang.org/t/vscode-language-server-wont-start/64325/6 "2021-07-18T12:47:20Z")

</div>

Great! Thanks!