WebpackOptions not found

[dboaretti]

Description

I was trying to update a fedora machine from JupyterLab 2.2.4 to JupyterLab 3.0.14. This operation was successful on 2 other similar machines, but not on this one. We have a problem loading the welcome page after successfully logging in. This is the output from journalctl:

Jul 19 14:34:29 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:29.382 SingleUserLabApp log:174] 302 GET /user/bdaniele/ -> /user/bdaniele/lab? (@127.0.0.1) 0.70ms
Jul 19 14:34:30 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:30.662 SingleUserLabApp log:174] 302 GET /user/bdaniele/lab? -> /hub/api/oauth2/authorize?client_id=jupyterhub-user-bdaniele&re>
Jul 19 14:34:31 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:31.528 SingleUserLabApp auth:981] Logged-in user {'kind': 'user', 'name': 'bdaniele', 'admin': False, 'groups': [], 'server': '>
Jul 19 14:34:31 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:31.529 SingleUserLabApp log:174] 302 GET /user/bdaniele/oauth_callback?code=[secret]&state=[secret] -> /user/bdaniele/lab? (@10>
Jul 19 14:34:32 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:32.107 SingleUserLabApp log:174] 200 GET /user/bdaniele/lab? (bdaniele@10.249.112.8) 7.31ms
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:40.078 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/terminals?1626698078737 (bdaniele@10.249.112.8) 12.37ms
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:40.500 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/kernelspecs?1626698078664 (bdaniele@10.249.112.8) 5.61ms
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [W 2021-07-19 14:34:40.595 SingleUserLabApp web:1787] 404 GET /user/bdaniele/lab/api/settings?1626698078713 (10.249.112.8): Schema not found: /usr/local/share/jupyter/lab/schemas/WebpackOptions.json
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [W 2021-07-19 14:34:40.595 LabApp] Schema not found: /usr/local/share/jupyter/lab/schemas/WebpackOptions.json
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [W 2021-07-19 14:34:40.596 SingleUserLabApp log:174] 404 GET /user/bdaniele/lab/api/settings?1626698078713 (bdaniele@10.249.112.8) 95.44ms
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:40.599 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/kernels?1626698078725 (bdaniele@10.249.112.8) 1.92ms
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:40.600 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/sessions?1626698078731 (bdaniele@10.249.112.8) 2.09ms
Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:40.790 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/kernelspecs?1626698080618 (bdaniele@10.249.112.8) 2.86ms
Jul 19 14:34:51 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:51.201 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/kernels?1626698090964 (bdaniele@10.249.112.8) 1.37ms
Jul 19 14:34:51 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:51.442 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/sessions?1626698090967 (bdaniele@10.249.112.8) 1.42ms
Jul 19 14:34:51 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-19 14:34:51.709 SingleUserLabApp log:174] 200 GET /user/bdaniele/api/terminals?1626698090473 (bdaniele@10.249.112.8) 1.25ms
Jul 19 14:35:14 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [I 2021-07-1

the lines which break are here:

Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [W 2021-07-19 14:34:40.595 SingleUserLabApp web:1787] 404 GET /user/bdaniele/lab/api/settings?1626698078713 (10.249.112.8): Schema not found: /usr/local/share/jupyter/lab/schemas/WebpackOptions.json Jul 19 14:34:40 g-wst-lbb-jupyter2.ethz.ch jupyterhub[27243]: [W 2021-07-19 14:34:40.595 LabApp] Schema not found: /usr/local/share/jupyter/lab/schemas/WebpackOptions.json

These lines do not show up when logging in to the other updated machines I mentioned. I am wondering where it could come from. The console output has many of these errors (here the pic is cropped):

It would be great to receive your help. Thank you! 😄

[fcollonval]

Hey I would clean the machine of JupyterLab - in particular remove the folder /usr/local/share/jupyter/lab. Then install JupyterLab 3.

[fcollonval]

You should try first without installing any extensions if you were using some. Then if JupyterLab works, install extensions again (as the error may be introduced by one of them).

[dboaretti]

Thanks! This is a shared machine in our group. Cleaning and updating the machine is a bit more difficult than normal. I reverted JupyterLab to version 2.3.1 which is working as expected. I hope to get back to it by the end of September, and maybe I will be luckier.

[dboaretti]

I tried to install it from a Python 3.9 environment that does not have jupyterlab but the problem persists. Is it possible that jupyterlab_server parses the path somehow in a wrong way? Webpack is a node module and I have noticed that there is some information for the migration from Jupyterlab 1 to 2 https://jupyterlab.readthedocs.io/en/2.2.x/developer/extension_migration.html?highlight=node_modules#updating-former-jupyterlab-coreutils-imports , maybe it's connected to this issue even if here the migration is different?

[fcollonval]

Are you using some extensions?

[dboaretti]

There were no extensions installed.

[fcollonval]

Would you mind reporting the content of /usr/local/share/jupyter/lab/schemas/ ?