Jupytext commands not showing up in Jupyterlab

I installed python 3.7.6, Jupyterlab 1.2.4, and Jupytext 1.3.2 through Conda, but when I restart Jupyterlab and search for Jupytext commands, none are showing up (see attached image). I also tried rebuilding Jupyterlab manually, but that didn’t help. I am reasonably sure that I’m using the same Conda environment I installed Jupytext to, to launch Jupyterlab.

Is there an incompatibility with the latest Jupyterlab, or is this an installation error on my part? Log given below:

> jupyter lab
[I 11:56:29.342 LabApp] JupyterLab extension loaded from /home/user/.local/lib/python3.7/site-packages/jupyterlab
[I 11:56:29.342 LabApp] JupyterLab application directory is /home/user/.local/share/jupyter/lab
[I 11:56:29.429 LabApp] [Jupytext Server Extension] Deriving a JupytextContentsManager from LargeFileManager
[W 11:56:29.432 LabApp] JupyterLab server extension not enabled, manually loading...
[I 11:56:29.434 LabApp] JupyterLab extension loaded from /home/user/.local/lib/python3.7/site-packages/jupyterlab
[I 11:56:29.434 LabApp] JupyterLab application directory is /home/user/.local/share/jupyter/lab
[I 11:56:29.436 LabApp] Serving notebooks from local directory: /home/user
[I 11:56:29.436 LabApp] The Jupyter Notebook is running at:
[I 11:56:29.436 LabApp] http://localhost:8888/?token=2ba776ad6225318b0537d4f1cca5fa19808b7afb419b29bb
[I 11:56:29.436 LabApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 11:56:29.502 LabApp] 
    
    To access the notebook, open this file in a browser:
        file:///run/user/1000/jupyter/nbserver-23010-open.html
    Or copy and paste one of these URLs:
        http://localhost:8888/?token=2ba776ad6225318b0537d4f1cca5fa19808b7afb419b29bb
[I 11:56:32.836 LabApp] 301 GET /lab/workspaces/auto-U/?clone (127.0.0.1) 1.12ms
[I 11:56:37.383 LabApp] Build is up to date

If this isn’t the place to post such questions, sorry; I found no mention of other support channels in the Jupytext documention or website.

[mhmulati]

Hello

Removing the file build_config.json cited in https://discourse.jupyter.org/t/extension-shows-up-as-both-installed-and-uninstalled-and-doesnt-work/2688/4 and https://github.com/jupyterlab/jupyterlab/issues/8122 solved the issue. I guess that is why the approach of @kaarelmand has worked.

Then I guess the issue appears when the extension is installed, removed, and reinstalled.

Hope it helps.

[richardso21]

Sorry for the very late response. Thank you @mwouts and @mhmulati for helping me with this. Turns out that this wasn’t an issue on jupytext’s end, but on jupyter lab and its bug with build_config.json. Jupytext works great now!