Error
untriagedC#DK
Type: <b>Bug</b>
## Issue Description ##
## Steps to Reproduce ##
## Expected Behavior ##
## Actual Behavior ##
Extension version: 2.140.9
VS Code version: Code 1.124.2 (6928394f91b684055b873eecb8bc281365131f1c, 2026-06-12T00:12:36Z)
OS version: Windows_NT x64 10.0.26100
Modes:
### Logs ###
<!--
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### C# log ###
<details>
```
2026-06-14 01:23:36.592 [info] Installing C# dependencies...
2026-06-14 01:23:36.592 [info]
2026-06-14 01:23:36.592 [info] Platform: win32, x86_64
2026-06-14 01:23:36.592 [info]
2026-06-14 01:23:36.592 [info] Downloading package 'Language server for Roslyn Copilot integration'
2026-06-14 01:23:38.437 [info] (47 KB)
2026-06-14 01:23:38.438 [info] .......
2026-06-14 01:23:38.692 [info] .......
2026-06-14 01:23:38.693 [info] ......
2026-06-14 01:23:38.693 [info] Done!
2026-06-14 01:23:38.695 [info] Validating download...
2026-06-14 01:23:38.695 [info] Integrity Check succeeded.
2026-06-14 01:23:38.695 [info] Installing package 'Language server for Roslyn Copilot integration'
2026-06-14 01:23:38.695 [info]
2026-06-14 01:23:38.718 [info] Downloading package 'VSWebAssemblyBridge (Platform Agnostic)'
2026-06-14 01:23:40.283 [info] (4143 KB)
2026-06-14 01:23:40.283 [info] .
2026-06-14 01:23:40.489 [info]
2026-06-14 01:23:40.696 [info]
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2026-06-14 01:23:41.961 [info]
2026-06-14 01:23:41.964 [info] Done!
2026-06-14 01:23:41.981 [info] Validating download...
2026-06-14 01:23:41.981 [info] Integrity Check succeeded.
2026-06-14 01:23:41.981 [info] Installing package 'VSWebAssemblyBridge (Platform Agnostic)'
2026-06-14 01:23:41.982 [info]
2026-06-14 01:23:42.163 [info] Finished
2026-06-14 01:23:42.163 [info]
2026-06-14 01:23:42.364 [info] Locating .NET runtime version 10.0.5
2026-06-14 01:23:44.157 [info] Did not find .NET 10.0.5 on path, falling back to acquire runtime via ms-dotnettools.vscode-dotnet-runtime
2026-06-14 01:24:07.923 [info] Dotnet path: c:\Users\Libeesh\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\10.0.9~x64~aspnetcore\dotnet.exe
2026-06-14 01:24:07.923 [info] Activating C# + C# Dev Kit...
2026-06-14 01:24:08.283 [info] info: Program[0]
2026-06-14 01:24:08.283 [info] Server started with process ID 110296
2026-06-14 01:24:10.741 [info] [Program] Language server initialized
2026-06-14 01:24:10.741 [info] [Program] Monitoring client process 17908 for exit
2026-06-14 01:24:11.651 [info] [initialized] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsEntryPointDiscovery] Finished discovery in 'c:\Tools_Dev' in 13 milliseconds
2026-06-14 01:24:18.648 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\Tools_Dev\StorageGuardian\StorageGuardian.csproj loaded by C# Dev Kit
2026-06-14 01:25:24.255 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\Tools_Dev\StorageGuardian\StorageGuardian_y3e2mhgm_wpftmp.csproj loaded by C# Dev Kit
2026-06-14 01:26:01.738 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\Tools_Dev\StorageGuardian\StorageGuardian_itbbiqzf_wpftmp.csproj loaded by C# Dev Kit
2026-06-14 01:26:37.115 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\Tools_Dev\StorageGuardian\StorageGuardian_kwmy4xch_wpftmp.csproj loaded by C# Dev Kit
2026-06-14 01:27:13.910 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\Tools_Dev\StorageGuardian\StorageGuardian_wpqwuspk_wpftmp.csproj loaded by C# Dev Kit
2026-06-14 01:27:15.153 [error] [textDocument/diagnostic] [LSP] System.InvalidOperationException: Sequence contains more than one element
at System.Linq.ThrowHelper.ThrowMoreThanOneElementException()
at Microsoft.CodeAnalysis.LanguageServer.Handler.Diagnostics.Public.PublicDocumentPullDiagnosticsHandler.CreateReturn(BufferedProgress`1 progress) in /_/src/LanguageServer/Protocol/Handler/Diagnostics/Public/PublicDocumentPullDiagnosticsHandler.cs:line 66
at Microsoft.CodeAnalysis.LanguageServer.Handler.Diagnostics.AbstractPullDiagnosticHandler`3.HandleRequestAsync(TDiagnosticsParams diagnosticsParams, RequestContext context, CancellationToken cancellationToken)
at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`1.StartRequestAsync[TRequest,TResponse](TRequest request, TRequestContext context, IMethodHandler handler, CancellationToken cancellationToken)
2026-06-14 01:27:15.156 [error] Request textDocument/diagnostic failed.
Message: Sequence contains more than one element
Code: -32000
[object Object]
2026-06-14 01:27:15.156 [error] Document pull failed for text document file:///c%3A/Tools_Dev/StorageGuardian/AssemblyInfo.cs
Message: Sequence contains more than one element
Code: -32000
[object Object]
2026-06-14 01:27:35.520 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\Tools_Dev\StorageGuardian\StorageGuardian_gnchdrlq_wpftmp.csproj loaded by C# Dev Kit
```
</details>
### C# LSP Trace Logs log ###
<details>
```
```
</details>
## Environment Information ##
**VSCode version**: 1.124.2
**C# Extension**: 2.140.9
**Using OmniSharp**: false
<details><summary>Dotnet Information</summary>
Host:
Version: 10.0.9
Architecture: x64
Commit: 901ca94124
RID: win-x64
.NET SDKs installed:
No SDKs were found.
.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.9 [c:\Users\Libeesh\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\10.0.9~x64~aspnetcore\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 10.0.9 [c:\Users\Libeesh\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\10.0.9~x64~aspnetcore\shared\Microsoft.NETCore.App]
Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]
Environment variables:
DOTNET_CLI_UI_LANGUAGE [en-US]
DOTNET_MULTILEVEL_LOOKUP [0]
DOTNET_NOLOGO [true]
global.json file:
Not found
Learn more:
https://aka.ms/dotnet/info
Download .NET:
https://aka.ms/dotnet/download
</details>
<details><summary>Visual Studio Code Extensions</summary>
|Extension|Author|Version|Folder Name|
|---|---|---|---|
|chatgpt|openai|26.609.30741|openai.chatgpt-26.609.30741-win32-x64|
|csdevkit|ms-dotnettools|3.20.199|ms-dotnettools.csdevkit-3.20.199-win32-x64|
|csharp|ms-dotnettools|2.140.9|ms-dotnettools.csharp-2.140.9-win32-x64|
|go|golang|0.54.0|golang.go-0.54.0|
|vscode-dotnet-runtime|ms-dotnettools|3.1.0|ms-dotnettools.vscode-dotnet-runtime-3.1.0|;
</details>
<details><summary>C# Settings</summary>
|Setting|Value|
|---|---|
|preferCSharpExtension|false|
|compilerDiagnosticScope|openFiles|
|analyzerDiagnosticScope|openFiles|
|enableXamlTools|true|
|useServerGC|true|;
</details>
<details>
<summary>System Info</summary>
|Item|Value|
|---|---|
|CPUs|Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz (4 x 2095)|
|GPU Status|2d_canvas: unavailable_software<br>GPU0: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VENDOR=Microsoft, DRIVER_VERSION=10.0.26100.1301 *ACTIVE*<br>GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.1301<br>GPU2: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.1301<br>Machine model name: <br>Machine model version: <br>direct_rendering_display_compositor: disabled_off_ok<br>gpu_compositing: disabled_software<br>multiple_raster_threads: enabled_on<br>opengl: disabled_off<br>rasterization: disabled_software<br>raw_draw: disabled_off_ok<br>skia_graphite: disabled_off<br>trees_in_viz: disabled_off<br>video_decode: disabled_software<br>video_encode: disabled_software<br>webgl: unavailable_software<br>webgpu: unavailable_software<br>webnn: unavailable_software|
|Load (avg)|undefined|
|Memory (System)|16.00GB (6.66GB free)|
|Process Argv||
|Screen Reader|no|
|VM|100%|
</details><details>
<summary>A/B Experiments</summary>
```
vsliv368:30146709
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
6abeh943:31336334
envsdeactivate2:31505458
cloudbuttont:31379625
3efgi100_wstrepl:31403338
ec5jj548:31422691
cp_cls_t_966_ss:31526232
4je02754:31466945
c3h7c220:31478652
38bie571_auto:31426784
cp_cls_c_1081:31454833
conptydll_true:31498968
ia-use-proxy-models-svc:31452481
e9c30283:31461165
test_treatment2:31471001
c9b86496:31447327
idci7584:31464702
e3e4d672:31494082
ei9d7968:31496641
chat:31457767
8hig5102:31480529
89g7j272:31518289
7e187181:31503455
i2gc6536:31499202
52612955:31516516
ghj88844:31499326
ddid_c:31478207
hmra_i5g22:31518061
7df3h592:31512476
cp_cls_t_1082:31516087
logging_enabled_new:31498466
db5d2638:31499441
nes-extended-cfe-himalia-004:31500446
jb_cp_cls_c_632:31524806
748c7209:31512887
32d76977:31512328
ha629193:31508444
cdk-lw-on:31524445
nes-charagree-1:31521370
31fi7170_t:31522396
jbcp_cls_pctr_t:31531130
61138546:31518536
gf14b233:31526830
nes-curr-leftover-1500:31530973
```
</details>
<!-- generated by issue reporter -->
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