Python extension is failing to load

[gurmitteotia]

Type: Bug

Everything was working until yesterday then after some auto updates on my Linux system, python extension is no more loading in VS Code. I tried by creating new conda environment but still facing same issue. I can use/switch conda environment without any issue.

While starting VS Code python extension is generating following error on "python" output windows-

2024-08-16 12:49:39.878 [info] Experiment 'pythonaa' is active
2024-08-16 12:49:39.878 [info] Experiment 'pythonCreateEnvOnPipInstall' is active
2024-08-16 12:49:39.878 [info] Experiment 'pythonRecommendTensorboardExt' is active
2024-08-16 12:49:39.878 [info] Experiment 'pythonSurveyNotificationcf' is active
2024-08-16 12:49:39.878 [info] Experiment 'pythonTerminalEnvVarActivation' is active
2024-08-16 12:49:39.878 [info] Experiment 'pythonTestAdapter' is active
2024-08-16 12:49:39.878 [info] Native locator: Refresh started
2024-08-16 12:49:39.878 [info] Default formatter is set to null for workspace /home/test_user/source/test_prod/test_project
2024-08-16 12:49:39.890 [info] > pyenv which python
2024-08-16 12:49:39.890 [info] cwd: .
2024-08-16 12:49:39.984 [info] Conda environment manager found at: /home/test_user/anaconda3/bin/conda
2024-08-16 12:49:40.016 [info] Native locator: Refresh finished in 591 ms
2024-08-16 12:49:40.025 [error] Python Extension: interpreterManager.refresh [s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
2024-08-16 12:49:40.150 [error] [
'Failed to check whether to display prompt for conda inherit env setting, Class name = v, completed in 1ms, has a falsy return value, Arg 1: Uri:/home/test_user/source/test_prod/test_project, Return Value: undefined',
[s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
]
2024-08-16 12:49:40.150 [error] [
'Failed to intialize conda inherit env prompt, Class name = v, completed in 3ms, has a falsy return value, Arg 1: Uri:/home/test_user/source/test_prod/test_project, Return Value: undefined',
[s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
]
2024-08-16 12:49:40.150 [error] [
'getActivatedEnvironmentVariables, Class name = D, completed in 2ms, has a falsy return value, Arg 1: Uri:/home/test_user/source/test_prod/test_project, Arg 2: undefined, Arg 3: undefined, Arg 4: "/usr/bin/bash"',
[s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
]
2024-08-16 12:49:40.150 [error] Failed to apply terminal env vars undefined [s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
2024-08-16 12:49:40.151 [error] [
'Failed to activate a workspace, Class name = m, completed in 401ms, has a falsy return value, Arg 1: Uri:/home/test_user/source/test_prod/test_project/env, Arg 2: {"started":1723808979277}, Return Value: undefined',
[s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
]
2024-08-16 12:49:40.151 [error] Failure during activation. [s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}
2024-08-16 12:49:40.151 [error] sendStartupTelemetry() failed. [s [Error]: Failed to resolve env "/home/test_user/anaconda3/envs/test_project"
at ae (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1968174)
at oe (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1966134)
at Immediate. (/home/test_user/.vscode/extensions/ms-python.python-2024.12.3-linux-x64/out/client/extension.js:2:1962428)
at process.processImmediate (node:internal/timers:478:21)] {
code: -4,
data: undefined
}

Extension version: 2024.12.3
VS Code version: Code 1.92.1 (eaa41d57266683296de7d118f574d0c2652e1fc4, 2024-08-07T20:16:39.455Z)
OS version: Linux x64 5.10.0-32-amd64
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz (5 x 0)
GPU Status	2d_canvas: unavailable_software canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: disabled_software multiple_raster_threads: enabled_on opengl: disabled_off rasterization: disabled_software raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software webgpu: disabled_off webnn: disabled_off
Load (avg)	1, 1, 1
Memory (System)	19.48GB (15.80GB free)
Process Argv	. --crash-reporter-id 321d204-a10f-47e1-9cb9-0f3750d1a082
Screen Reader	no
VM	100%
DESKTOP_SESSION	gnome
XDG_CURRENT_DESKTOP	GNOME
XDG_SESSION_DESKTOP	gnome
XDG_SESSION_TYPE	wayland

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[PrideChung]

Open VS Code "Settings", search for "Python Locator", switch from "native" to "js", this works for me.

[vinay-mylai]

I have the exact same issue (on Archlinux). In the settings, "Python Locator" is already set to "js" for me as the default.

[xyqjay]

Open VS Code "Settings", search for "Python Locator", switch from "native" to "js", this works for me.

It helps! Thanks！

After experiencing many searches and restarts, this resolved my issue.

Here is the error, Hope this helps you. :
macOS: 14.6.1 M2 Apple Chip
conda 24.7.1
Python 3.11.5
VS Code Version: 1.92.2

2024-08-18 00:13:10.275 [info] Extension host with pid 1438 started
2024-08-18 00:13:10.275 [info] Skipping acquiring lock for /Users/user/Library/Application Support/Code/User/workspaceStorage/efaeb32ad8b421d2af966460dd3af93b.
2024-08-18 00:13:10.385 [info] ExtensionService#_doActivateExtension mechatroner.rainbow-csv, startup: false, activationEvent: 'onLanguage:plaintext'
2024-08-18 00:13:10.392 [info] ExtensionService#_doActivateExtension vscode.emmet, startup: false, activationEvent: 'onLanguage'
2024-08-18 00:13:10.395 [info] ExtensionService#_doActivateExtension VisualStudioExptTeam.intellicode-api-usage-examples, startup: false, activationEvent: 'onLanguage:python'
2024-08-18 00:13:10.419 [info] ExtensionService#_doActivateExtension VisualStudioExptTeam.vscodeintellicode, startup: false, activationEvent: 'onLanguage:python'
2024-08-18 00:13:11.360 [info] ExtensionService#_doActivateExtension vscode.git-base, startup: true, activationEvent: '*', root cause: vscode.git
2024-08-18 00:13:11.378 [info] ExtensionService#_doActivateExtension vscode.git, startup: true, activationEvent: '*'
2024-08-18 00:13:11.388 [info] ExtensionService#_doActivateExtension vscode.github, startup: true, activationEvent: '*'
2024-08-18 00:13:11.422 [info] Eager extensions activated
2024-08-18 00:13:11.426 [info] ExtensionService#_doActivateExtension vscode.debug-auto-launch, startup: false, activationEvent: 'onStartupFinished'
2024-08-18 00:13:11.427 [info] ExtensionService#_doActivateExtension vscode.merge-conflict, startup: false, activationEvent: 'onStartupFinished'
2024-08-18 00:13:11.430 [info] ExtensionService#_doActivateExtension eamodio.gitlens, startup: false, activationEvent: 'onStartupFinished'
2024-08-18 00:13:11.448 [info] ExtensionService#_doActivateExtension esbenp.prettier-vscode, startup: false, activationEvent: 'onStartupFinished'
2024-08-18 00:13:11.468 [info] ExtensionService#_doActivateExtension vadimcn.vscode-lldb, startup: false, activationEvent: 'onStartupFinished'
2024-08-18 00:13:11.535 [info] ExtensionService#_doActivateExtension vscode.github-authentication, startup: false, activationEvent: 'onAuthenticationRequest:github'
2024-08-18 00:13:28.029 [info] ExtensionService#_doActivateExtension ms-python.python, startup: false, activationEvent: 'onLanguage:python', root cause: ms-python.debugpy
2024-08-18 00:13:28.152 [info] ExtensionService#_doActivateExtension ms-python.debugpy, startup: false, activationEvent: 'onLanguage:python'
2024-08-18 00:13:28.160 [info] ExtensionService#_doActivateExtension ms-python.vscode-pylance, startup: false, activationEvent: 'onLanguage:python'
2024-08-18 00:13:30.051 [error] Error: Failed to resolve env "/Users/user/anaconda3"
	at ae (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1968174)
	at oe (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1966134)
	at Immediate.<anonymous> (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1962428)
	at process.processImmediate (node:internal/timers:478:21)
2024-08-18 00:13:32.360 [error] Error: Failed to resolve env "/Users/user/anaconda3"
	at ae (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1968174)
	at oe (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1966134)
	at Immediate.<anonymous> (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1962428)
	at process.processImmediate (node:internal/timers:478:21)
2024-08-18 00:13:34.949 [error] Error: Failed to resolve env "/Users/user/anaconda3"
	at ae (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1968174)
	at oe (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1966134)
	at Immediate.<anonymous> (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1962428)
	at process.processImmediate (node:internal/timers:478:21)
2024-08-18 00:14:01.138 [info] ExtensionService#_doActivateExtension vscode.configuration-editing, startup: false, activationEvent: 'onLanguage:jsonc'
2024-08-18 00:14:01.142 [info] ExtensionService#_doActivateExtension vscode.json-language-features, startup: false, activationEvent: 'onLanguage:jsonc'
2024-08-18 00:14:01.154 [info] ExtensionService#_doActivateExtension vscode.typescript-language-features, startup: false, activationEvent: 'onLanguage:jsonc'
2024-08-18 00:15:35.204 [error] Error: Failed to resolve env "/Users/user/anaconda3"
	at ae (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1968174)
	at oe (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1966134)
	at Immediate.<anonymous> (/Users/user/.vscode/extensions/ms-python.python-2024.12.3-darwin-arm64/out/client/extension.js:2:1962428)
	at process.processImmediate (node:internal/timers:478:21)

[corneliusroemer]

This is potentially the same issue as #23963 and #23922

Switching Python Locator is just a workaround - there's still a bug somewhere.

[anthonykim1]

Does

Open VS Code "Settings", search for "Python Locator", switch from "native" to "js", this works for me

work for you? @gurmitteotia

[gurmitteotia]

@anthonykim1 No, changing of "Python Locator" to "js" does not solve the issue for me. However downgrade of following 2 extension solve the issue for now. Looks like a bug in newer version.

pylance = v2024.7.1
python= v2024.8.1

[vinay-mylai]

@gurmitteotia : Thanks. Downgrading fixes the issue for me too.

[anthonykim1]

@karthiknadig I think the error "Failed to resolve env...etc" is coming from

/vscode-python/python-env-tools/crates/pet/src/jsonrpc.rs

[agonzaleziniguez]

Switching from "native" to "js" in Python Locator solved the problem for me. However, in the Python Locator Output I still see the following:

2024-09-14 12:48:53.174 [info] Starting Python Locator c:\Users<USER>.vscode\extensions\ms-python.python-2024.14.1-win32-x64\python-env-tools\bin\pet.exe server
2024-09-14 12:48:53.174 [error] thread '' panicked at crates\pet-windows-store\src\lib.rs:20:65:
byte index 1 is out of bounds of ``
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

2024-09-14 12:48:53.174 [error] thread '' panicked at crates\pet\src\find.rs:76:17:
a scoped thread panicked
thread '' panicked at crates\pet\src\find.rs:70:5:
a scoped thread panicked

2024-09-14 12:48:53.286 [warning] Failed to open HKLM\Software\Python, Os { code: 2, kind: NotFound, message: "The system cannot find the file specified." }
2024-09-14 12:48:53.288 [info] Discovered env: C:\Users<USER>\AppData\Local\Programs\Python\Python310\python.exe
2024-09-14 12:48:53.288 [info] Discovered env: C:\Users<USER>\AppData\Local\Programs\Python\Python311\python.exe
2024-09-14 12:48:53.289 [info] Discovered env: C:\Users<USER>\AppData\Local\Programs\Python\Python312\python.exe
2024-09-14 12:48:53.289 [info] Discovered env: C:\Users<USER>\AppData\Local\Programs\Python\Python38\python.exe
2024-09-14 12:48:53.290 [info] Discovered manager: (Conda) C:\Users<USER>\AppData\Local\miniforge3\Scripts\conda.exe
2024-09-14 12:48:53.290 [info] Discovered env: C:\Users<USER>\AppData\Local\miniforge3\envs\bilbao\python.exe
2024-09-14 12:48:53.290 [info] Discovered env: C:\Users<USER>\AppData\Local\miniforge3\envs\test_wengine\python.exe
2024-09-14 12:48:53.290 [info] Discovered env: C:\Users<USER>\AppData\Local\miniforge3\envs\test_wengine2\python.exe
2024-09-14 12:48:53.291 [info] Discovered env: C:\Users<USER>\AppData\Local\miniforge3\python.exe
2024-09-14 12:48:53.291 [info] Discovered env: C:\Users<USER>\AppData\Local\miniforge3\envs\py\python.exe

---

Windows 10
VS Code Version: 1.93.1
Python extension: 2024.14.1