Exception at reading 'uiMode' when clicked from settings on the home page

[Taha-249]

Description

When there is no python environment found, jupyter labs cannot create new session. However, by changing on start up to create a new session generates this exception. There is the following blank screen.

on clicking the hamburger button, it generates the following exception.

Reinstalling program does not seem to fix the issue.

• Operating System and version: Windows 10 22H2
• JupyterLab-Desktop version: latest

[JasonWeill]

@Taha-249 Thank you for opening this issue! Do you see any information in the logs when you start JupyterLab Desktop? You can find info about logs here: https://github.com/jupyterlab/jupyterlab-desktop/blob/master/troubleshoot.md#Logs

[JasonWeill]

@Taha-249 To follow up, can you please check for any info in the logs on startup and add it as a comment to this issue? Thanks!

[JasonWeill]

Without info from the logs, or any other reports, I'm going to close this issue. Please reopen or open a new issue if you continue to see problems in JupyterLab. Thanks!

[krassowski]

I encountered this on a fresh installation on Ubuntu 24.04 with pyenv installed. When I run jlab . --no-sandbox I saw no contents

Upon pressing the hamburger icon I saw:

The logs are:

[2024-09-20 11:08:03.055] [error] Python path "/home/krassowski/.config/jupyterlab-desktop/jlab_server/bin/python" does not exist.
[2024-09-20 11:08:05.243] [error] Failed to create free server Error: No default environment found!
    at /snap/jupyterlab-desktop/31/resources/app.asar/build/out/main/registry.js:282:32
[2024-10-01 12:45:16.909] [error] Python path "/home/krassowski/.config/jupyterlab-desktop/jlab_server/bin/python" does not exist.
[2024-10-01 12:45:19.902] [error] Failed to get environment info at path '/home/krassowski/.pyenv/shims/python'. Error: Command failed: /home/krassowski/.pyenv/shims/python -c import os, sys, json, platform, importlib

env_type = 'system'
env_name = 'python'
python_version = platform.python_version()
default_kernel = 'python3'

requirements = [
  'jupyterlab'
]

versions = {
  "python": python_version
}

for requirement in requirements:
  try:
    module = importlib.import_module(requirement)
    versions[requirement] = module.__version__
  except:
    versions[requirement] = 'NOT-FOUND'

if (getattr(sys, "base_prefix", None) or getattr(sys, "real_prefix", None) or sys.prefix) != sys.prefix:
  env_type = 'venv'

if env_type != 'venv' and os.path.exists(os.path.join(sys.prefix, "conda-meta")):
  is_root = os.path.exists(os.path.join(sys.prefix, "condabin"))
  env_type = 'conda-root' if is_root else 'conda-env'

if env_type != 'system':
  env_name = os.path.basename(sys.prefix)

try:
  import jupyter_client
  mkm = jupyter_client.multikernelmanager.MultiKernelManager()
  default_kernel = mkm.default_kernel_name
except:
  pass

print(json.dumps({"type" : env_type, "name": env_name, "versions" : versions, "defaultKernel": default_kernel}))

pyenv: python: command not found

The `python' command exists in these Python versions:
  3.9.11
  3.9.20

Note: See 'pyenv help global' for tips on allowing both
      python2 and python3 to be found.

    at ChildProcess.exithandler (node:child_process:430:12)
    at ChildProcess.emit (node:events:514:28)
    at maybeClose (node:internal/child_process:1091:16)
    at Socket.<anonymous> (node:internal/child_process:449:11)
    at Socket.emit (node:events:514:28)
    at Pipe.<anonymous> (node:net:323:12)
[2024-10-01 12:45:20.402] [error] Failed to create free server Error: No default environment found!
    at /snap/jupyterlab-desktop/31/resources/app.asar/build/out/main/registry.js:282:32
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

I think that the robustness of the UI could be improved. It could also display a helpful message rather than crash.

[krassowski]

The pyenv version errors appear unrelated, I still get the error after solving them (but the window is no longer blank)

[Nagidrop]

I can reproduce this error consistently: whenever I launch JupyterLab Desktop (normally) and quickly click on the hamburger menu icon (while window is still blank), the error dialog shows up. Then, the windows is still blank until you close the dialog. After closing, the app starts without further errors and functions normally.

I use custom Python environment (miniconda3) on latest version of JupyterLab (4.2.5) and JupyterLab Desktop (4.2.5-1) on Windows 11.

I have recorded a video for showcasing:

2024-10-04.20-04-16.mp4

The logs show 2 warnings and 1 error but they appear only after JupyterLab Desktop has successfully launched. I attached them anyway:

[2024-10-04 20:04:14.770] [info]  In production mode
[2024-10-04 20:04:14.772] [info]  Logging to file (C:\Users\Nagi\AppData\Roaming\jupyterlab-desktop\logs\main.log) at 'info' level
[2024-10-04 20:04:24.355] [warn]  Unsatisfied version 2.3.2 from @jupyterlab/application-top of shared singleton module @lumino/widgets (required ^1.37.2)
[2024-10-04 20:04:25.256] [warn]  Language pack 'English_United States' not valid!
[2024-10-04 20:04:25.291] [verbose] Starting application in workspace: "default"
[2024-10-04 20:04:26.336] [error] Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'type')
[2024-10-04 20:04:26.615] [verbose] Starting WebSocket: ws://localhost:53679/api/kernels/a148d065-b663-42de-af19-4a3bd95d9c08