Command 'Python: Restart Language Server' resulted in an error (command 'python.analysis.restartLanguageServer' not found)

[NicoNekoru]

Type: Bug

When attempting to run Python: Restart Language Server a dialog box with the content

Command 'Python: Restart Language Server' resulted in an error (command 'python.analysis.restartLanguageServer' not found)

Appears. Followed the steps to solve in #13474 (uninstall python extension and delete the residual extensions folder) but the issue was not resolved.

Extension version: 2024.14.1
VS Code version: Code 1.91.1 (f1e16e1e6214d7c44d078b1f0607b2388f29d729, 2024-07-09T22:06:49.809Z)
OS version: Windows_NT x64 10.0.22631
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.11.3
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): System
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

Installed Extensions

Extension Name	Extension Id	Version
:emojisense:	bierner.emojisense	0.10.0
.NET Install Tool	ms-dotnettools.vscode-dotnet-runtime	2.1.7
Apc Customize UI++	drcika.apc-extension	0.3.9
Auto Rename Tag	formulahendry.auto-rename-tag	0.1.10
Ayu	teabyii.ayu	1.0.5
Better Comments	aaron-bond.better-comments	3.0.2
C#	ms-dotnettools.csharp	2.50.25
CSS Modules	clinyong.vscode-css-modules	0.5.1
Debugger for Java	vscjava.vscode-java-debug	0.58.0
Dev Containers	ms-vscode-remote.remote-containers	0.388.0
Docker	ms-azuretools.vscode-docker	1.29.2
ElixirLS: Elixir support and debugger	JakeBecker.elixir-ls	0.23.1
ESLint	dbaeumer.vscode-eslint	3.0.10
Extension Pack for Java	vscjava.vscode-java-pack	0.29.0
GitLens — Git supercharged	eamodio.gitlens	15.6.0
Gradle for Java	vscjava.vscode-gradle	3.16.4
Halcyon Theme	brittanychiang.halcyon-vscode	0.3.1
Heex HTML	ritvyk.heex-html	0.0.5
IntelliCode	VisualStudioExptTeam.vscodeintellicode	1.3.1
IntelliCode API Usage Examples	VisualStudioExptTeam.intellicode-api-usage-examples	0.2.8
JavaScript and TypeScript Nightly	ms-vscode.vscode-typescript-next	5.7.20241007
JavaScript Debugger	ms-vscode.js-debug	1.91.0
JavaScript Debugger Companion Extension	ms-vscode.js-debug-companion	1.1.2
Jupyter	ms-toolsai.jupyter	2024.6.0
Jupyter Cell Tags	ms-toolsai.vscode-jupyter-cell-tags	0.1.9
Jupyter Keymap	ms-toolsai.jupyter-keymap	1.1.2
Jupyter Notebook Renderers	ms-toolsai.jupyter-renderers	1.0.19
Jupyter Slide Show	ms-toolsai.vscode-jupyter-slideshow	0.1.6
Language Support for Java(TM) by Red Hat	redhat.java	1.35.1
Live Preview	ms-vscode.live-server	0.4.15
Markdown All in One	yzhang.markdown-all-in-one	3.6.2
Material Icon Theme	PKief.material-icon-theme	5.11.1
Maven for Java	vscjava.vscode-maven	0.44.0
Monokai Pro	monokai.theme-monokai-pro-vscode	1.3.2
PowerShell	ms-vscode.powershell	2024.2.2
Prettier - Code formatter	esbenp.prettier-vscode	11.0.0
Prettier ESLint	rvest.vs-code-prettier-eslint	6.0.0
Pretty TypeScript Errors	YoavBls.pretty-ts-errors	0.6.0
Project Manager for Java	vscjava.vscode-java-dependency	0.24.0
Pylance	ms-python.vscode-pylance	2024.10.1
Python	ms-python.python	2024.14.1
Python Debugger	ms-python.debugpy	2024.8.0
rust-analyzer	rust-lang.rust-analyzer	0.3.2137
Svelte for VS Code	svelte.svelte-vscode	109.0.3
Svelte Intellisense	ardenivanov.svelte-intellisense	0.7.1
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.9
Tailwind CSS IntelliSense	bradlc.vscode-tailwindcss	0.12.11
Test Runner for Java	vscjava.vscode-java-test	0.42.0
Vim	vscodevim.vim	1.28.1
WSL	ms-vscode-remote.remote-wsl	0.88.4

System Info

Item	Value
CPUs	11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz (8 x 2995)
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 vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	15.85GB (0.71GB free)
Process Argv	--folder-uri file:///c%3A/Users/kaima/Desktop/Programming/Quant --crash-reporter-id 75cc42d3-c13c-4cdb-b577-8ac88e67c787
Screen Reader	no
VM	0%

A/B Experiments

vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30256859
vscod805:30301674
binariesv615:30325510
vsaa593cf:30376535
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
962ge761:30959799
pythongtdpath:30769146
pythonnoceb:30805159
asynctok:30898717
pythonmypyd1:30879173
2e7ec940:31000449
pythontbext0:30879054
accentitlementsc:30995553
dsvsc016:30899300
dsvsc017:30899301
dsvsc018:30899302
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
g316j359:31013175
a69g1124:31058053
dvdeprecation:31068756
dwnewjupyter:31046869
2f103344:31071589
impr_priority:31102340
nativerepl2:31139839
refactort:31108082
pythonrstrctxt:31112756
flightc:31134773
wkspc-onlycs-t:31132770
nativeloc1:31134641
wkspc-ranged-t:31151552
defaultse:31146405
notype1cf:31151524
cc771715:31146322

[karthiknadig]

This is often the case if the extension failed to activate. Do you see any errors in the Output> Python panel, or the console logs (Help> Toggle Developer Tools)

[github-actions]

Because we have not heard back with the information we requested, we are closing this issue for now. If you are able to provide the info later on, then we will be happy to re-open this issue to pick up where we left off.

Happy Coding!

[davetapley]

I'm getting this increasingly regularly now (couple of times daily).

Everything will be fine, then I'll lose syntax highlighting, then when I try restart language server from the palette I get the same:

command 'python.analysis.restartLanguageServer' not found

Python output:

2025-04-12 19:18:00.476 [info] [Info  - 7:18:00 PM] (3055) Starting service instance "<default>" for workspace ""
2025-04-12 19:18:00.503 [info] [Info  - 7:18:00 PM] (3055) Setting environmentName for service "<default>": "3.12.2 (global)"
2025-04-12 19:18:00.504 [info] [Info  - 7:18:00 PM] (3055) Setting pythonPath for service "<default>": "/home/codespace/.python/current/bin/python"
2025-04-12 19:18:00.504 [info] [Info  - 7:18:00 PM] (3055) No include entries specified; assuming /<default workspace root>
2025-04-12 19:18:00.504 [info] [Info  - 7:18:00 PM] (3055) Auto-excluding **/node_modules

2025-04-12 19:18:00.504 [info] [Info  - 7:18:00 PM] (3055) Auto-excluding **/__pycache__
2025-04-12 19:18:00.504 [info] [Info  - 7:18:00 PM] (3055) Auto-excluding **/.*
2025-04-12 19:18:00.540 [info] [Info  - 7:18:00 PM] (3055) Assuming Python version 3.12.2.final.0
2025-04-12 19:18:00.594 [info] [Error - 7:18:00 PM] (3055) File or directory "/<default workspace root>" does not exist.
2025-04-12 19:18:00.594 [info] [Info  - 7:18:00 PM] (3055) No source files found.
2025-04-12 19:18:01.033 [info] [Info  - 7:18:01 PM] (3055) BG: Priority queue background worker(10) root directory: file:///home/codespace/.vscode-remote/extensions/ms-python.vscode-pylance-2025.4.1/dist
2025-04-12 19:18:01.033 [info] [Info  - 7:18:01 PM] (3055) BG: Priority queue background worker(10) started

Dev tools:

log.ts:460   ERR [remote-connection][ExtensionHost][f9d2a…][reconnect][WebSocket(127.0.0.1:39175)] received error control message when negotiating connection. Error:
log.ts:460   ERR [remote-connection][ExtensionHost][f9d2a…][reconnect] A permanent error occurred in the reconnecting loop! Will give up now! Error:
abstractExtensionService.ts:849 Extension host (Remote) terminated unexpectedly. Code: 0, Signal: f9d2a859-2ab9-4c9d-85bd-d2f0a2b9d9cf

Closing and reopening the Window, and reconnecting to Codespace fixes it.