Error: Invalid NAME when creating a new notebook

[my1e5]

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I'm trying to use the marimo extension on Windows 10 and getting an error with the file name/paths it generates. I'm using uvx and sandbox but it happens without those settings too.

{
  "marimo.marimoPath": "uvx marimo",
  "marimo.sandbox": true
}

To reproduce, run open the Command Palette and execute

marimo: Create new marimo notebook

and enter a name (e.g. foo).

This creates a file called foo.py and a command is automatically executed in the terminal (Git Bash in my case)

$ uvx marimo --yes edit c:\Users\my1e5\Projects\notebooks --host=localhost --port=2818 --headless --no-token --sandbox --watch
Running in a sandbox: uv run --isolated --no-project --with-requirements C:\Users\my1e5\AppData\Local\Temp\tmp7ybiil8n.txt --refresh marimo --yes edit c:Usersmy1e5Projectsnotebooks --host=localhost --port=2818 --headless --no-token --watch
Installed 36 packages in 3.19s
Error: Invalid NAME - c:Usersmy1e5Projectsnotebooks is not a Python or Markdown file

It looks like the foo.py file path isn't added to command properly? It just stops at \notebooks which is the folder I'm in. Also, I don't know if this a Windows/Git Bash thing, but maybe the file path gets formatted wrong because it comes out as c:Usersmy1e5Projectsnotebooks?

System and Version info

Name: marimo
Id: marimo-team.vscode-marimo
Description: Run marimo in VSCode
Version: 0.5.1
Publisher: marimo.io
VS Marketplace Link: https://marketplace.visualstudio.com/items/?itemName=marimo-team.vscode-marimo

Version: 1.100.0-insider (user setup)
Commit: 174af221c9ea2ccdb64abe4aab8e1a805e77beae
Date: 2025-04-09T05:05:17.975Z
Electron: 34.4.1
ElectronBuildId: 11317338
Chromium: 132.0.6834.210
Node.js: 20.18.3
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045

[mscolnick]

Looks like an issue in the extension when using windows: c:\Users\my1e5\Projects\notebooks gets reduced to c:Usersmy1e5Projectsnotebooks and fails. Definitely a bug

[mscolnick]

@my1e5, this should be fixed now. can you try out version ^0.6.0

[my1e5]

Just tried the same steps with 0.6.3 but I'm getting a different error now.

$ uvx marimo --yes edit c:\Users\my1e5\Projects\Test\marimo-test --host=localhost --port=2818 --headless --no-token --sandbox --watch
Running in a sandbox: uv run --isolated --no-project --compile-bytecode --with-requirements C:\Users\my1e5\AppData\Local\Temp\tmpxmmmym1w.txt --refresh marimo --yes edit c:Usersmy1e5ProjectsTestmarimo-test --host=localhost --port=2818 --headless --no-token --watch
Installed 36 packages in 3.34s
error: Failed to bytecode-compile Python file in: C:\Users\my1e5\AppData\Local\uv\cache\builds-v0\.tmpmfZcxq\Lib\site-packages
  Caused by: Failed to create temporary script file
  Caused by: failed to write to file `C:\Users\my1e5\AppData\Local\uv\cache\.tmpkm7FDB\pip_compileall.py`: The requested operation cannot be performed on a file with a user-mapped section open. (os error 1224)

System and Version info

$ uv --version
uv 0.6.17 (8414e9f3d 2025-04-25)

Name: marimo
Id: marimo-team.vscode-marimo
Description: Run marimo in VSCode
Version: 0.6.3
Publisher: marimo.io
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=marimo-team.vscode-marimo

Version: 1.100.0-insider (user setup)
Commit: f56819db693dba84feb3716e278b5be0a7378633
Date: 2025-04-17T05:10:42.956Z
Electron: 34.4.1
ElectronBuildId: 11317338
Chromium: 132.0.6834.210
Node.js: 20.18.3
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045

[mscolnick]

Unsure if this is a problem with uv now. can you remove your marimoPath and not use sandbox for now. The README has a few other instructions for configuration.

[my1e5]

I think the issue might be a mixture of the --sandbox flag and a difference between using forward/backward slashes. I just tested these differentuxv marimo commands on their own. My default terminal is Git Bash.

Backward slashes

with --sandbox

$ uvx marimo --yes edit c:\Users\my1e5\Projects\Test\marimo-test --host=localhost --port=2818 --headless --no-token --watch --sandbox
Running in a sandbox: uv run --isolated --no-project --compile-bytecode --with-requirements C:\Users\my1e5\AppData\Local\Temp\tmpav3tajlf.txt --refresh marimo --yes edit c:Usersmy1e5ProjectsTestmarimo-test --host=localhost --port=2818 --headless --no-token --watch
Installed 36 packages in 2.82s
error: Failed to bytecode-compile Python file in: C:\Users\my1e5\AppData\Local\uv\cache\builds-v0\.tmpkQwa74\Lib\site-packages
  Caused by: Failed to create temporary script file
  Caused by: failed to write to file `C:\Users\my1e5\AppData\Local\uv\cache\.tmp70jug0\pip_compileall.py`: The requested operation cannot be performed on a file with a user-mapped section open. (os error 1224)

without --sandbox

$ uvx marimo --yes edit c:\Users\my1e5\Projects\Test\marimo-test --host=localhost --port=2818 --headless --no-token --watch
Error: Invalid NAME - c:Usersmy1e5ProjectsTestmarimo-test is not a Python or Markdown file

Forward slashes

with --sandbox

$ uvx marimo --yes edit c:/Users/my1e5/Projects/Test/marimo-test --host=localhost --port=2818 --headless --no-token --watch --sandbox
Running in a sandbox: uv run --isolated --no-project --compile-bytecode --with-requirements C:\Users\my1e5\AppData\Local\Temp\tmpoo3_waeh.txt --refresh marimo --yes edit c:/Users/my1e5/Projects/Test/marimo-test --host=localhost --port=2818 --headless --no-token --watch
Installed 36 packages in 2.86s
error: Failed to bytecode-compile Python file in: C:\Users\my1e5\AppData\Local\uv\cache\builds-v0\.tmprwBS5R\Lib\site-packages
  Caused by: Failed to create temporary script file
  Caused by: failed to write to file `C:\Users\my1e5\AppData\Local\uv\cache\.tmprCt9Rq\pip_compileall.py`: The requested operation cannot be performed on a file with a user-mapped section open. (os error 1224)

without --sandbox

$ uvx marimo --yes edit c:/Users/my1e5/Projects/Test/marimo-test --host=localhost --port=2818 --headless --no-token --watch

        Create or edit notebooks in your browser 📝

        ➜  URL: http://localhost:2818

[mscolnick]

thank you for the detailed repro. this seems to be an issue on marimo proper then, and not the vscode extension: https://github.com/marimo-team/marimo

@my1e5 do you mind filing an issue on https://github.com/marimo-team/marimo/issues with your findings. i think fixing it there, should fix this issue

[mscolnick]

Hi, we've launched a new VSCode extension at https://github.com/marimo-team/marimo-lsp (readme). It may mean this issue is resolved or no longer applicable. If the issue still exists, please file the issue on over on the new Issues page.