Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.

[davidortinau]

Type: Bug

2025-03-04 14:32:32.485 [info] Locating .NET runtime version 9.0.1
2025-03-04 14:32:32.742 [info] Dotnet path: /usr/local/share/dotnet/dotnet
2025-03-04 14:32:32.742 [info] Activating C# + C# Dev Kit...
2025-03-04 14:32:33.202 [error] [stderr] Unhandled exception: System.BadImageFormatException: An attempt was made to load a program with an incorrect format.
 (0x8007000B)
   at Microsoft.CodeAnalysis.ImmutableArrayExtensions.SelectAsArrayAsync[TItem,TResult](ImmutableArray`1 array, Func`3 selector, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Options.GlobalOptionService.<GetOptionPersisters>g__GetOptionPersistersAsync|7_1(ImmutableArray`1 persisterProviders, CancellationToken cancellationToken) in /_/src/Workspaces/Core/Portable/Options/GlobalOptionService.cs:line 75
   at Roslyn.Utilities.TaskExtensions.WaitAndGetResult_CanCallOnBackground[T](Task`1 task, CancellationToken cancellationToken) in /_/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Utilities/TaskExtensions.cs:line 56
   at Microsoft.CodeAnalysis.Options.GlobalOptionService.GetOptionPersisters() in /_/src/Workspaces/Core/Portable/Options/GlobalOptionService.cs:line 48
   at Microsoft.CodeAnalysis.Options.GlobalOptionService.SetGlobalOptions(OneOrMany`1 options) in /_/src/Workspaces/Core/Portable/Options/GlobalOptionService.cs:line 192
   at Microsoft.CodeAnalysis.Options.GlobalOptionService.SetGlobalOption(OptionKey2 optionKey, Object value) in /_/src/Workspaces/Core/Portable/Options/GlobalOptionService.cs:line 184
   at Microsoft.CodeAnalysis.Options.GlobalOptionService.SetGlobalOption[T](Option2`1 option, T value) in /_/src/Workspaces/Core/Portable/Options/GlobalOptionService.cs:line 178
   at Program.<<Main>$>g__RunAsync|0_0(ServerConfiguration serverConfiguration, CancellationToken cancellationToken) in /_/src/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/Program.cs:line 107
   at System.CommandLine.CliCommand.<>c__DisplayClass32_0.<<SetAction>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Invocation.InvocationPipeline.InvokeAsync(ParseResult parseResult, CancellationToken cancellationToken)

2025-03-04 14:32:33.273 [info] Language server process exited with 1
2025-03-04 14:32:33.278 [info] [Error - 2:32:33 PM] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
2025-03-04 14:32:33.278 [info] Error: Language server process exited unexpectedly
    at ChildProcess.<anonymous> (/Users/davidortinau/.vscode-insiders/extensions/ms-dotnettools.csharp-2.67.20-darwin-arm64/dist/extension.js:2:1194136)
    at ChildProcess.emit (node:events:530:35)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:293:12)

Extension version: 2.67.20
VS Code version: Code - Insiders 1.98.0-insider (21d13f4350b0651abfae76b98651d7c72551dff1, 2025-03-04T09:16:37.178Z)
OS version: Darwin arm64 24.3.0
Modes:

System Info

Item	Value
CPUs	Apple M4 Max (16 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	5, 5, 5
Memory (System)	64.00GB (3.00GB free)
Process Argv	. --crash-reporter-id 9f9ad6ad-88e1-448d-baf4-d250e72b38cb
Screen Reader	no
VM	0%

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[rachelkang]

I've been running into the same

[rachelkang]

also seeing it on VS Code stable, latest preview of C# Dev Kit version 1.17.48

[rmarinho]

Running the same .. I have net10 installed, could it be related?

[JoeRobich]

Duplicate of #8034

[JoeRobich]

@davidortinau @rachelkang @rmarinho What repos are you seeing this with? Also, can you share dotnet --info so I can get a better sense of which sdks and runtimes are installed?

[JoeRobich]

Never mind, I was able to reproduce it.