403 GET /voila/static/jupyter-flex-embed.css: jupyter-flex-embed.css is not in root static directory

[jmp75]

Relates to other relatively recent issues. I am trying to run examples using the dev mode, marginally hoping to figure out a fix.

Using the codebase at commit 7013993fcf910591196faeb725d5482b37adad8a april 2024

Following the guidelines as written in CONTRIBUTING.md, using task and hatch

From the newly created (jupyter-flex) virtual environnment, in the examples subfolder, task voila-examples launches:
voila --template flex --VoilaConfiguration.file_whitelist '.*'

Any of the notebooks available get stuck on ... building dashboard ...

403 GET /voila/static/jupyter-flex-embed.css (127.0.0.1): jupyter-flex-embed.css is not in root static directory
403 GET /voila/static/jupyter-flex-embed.css (127.0.0.1) 0.68ms
403 GET /voila/static/jupyter-flex-embed.css (127.0.0.1): jupyter-flex-embed.css is not in root static directory
403 GET /voila/static/jupyter-flex-embed.css (127.0.0.1) 0.85ms
404 GET /api/kernels?1715585460785 (127.0.0.1) 0.27ms
[Voila] WARNING | Notebook iris-clustering.ipynb is not trusted
[Voila] Kernel started: 44458986-ffe1-4081-94d2-614937680a35
Could not open static file '/usr/share/jupyter/nbconvert/templates/base/static/jupyter-flex-embed.css'
404 GET /voila/templates/flex/static/jupyter-flex-embed.css (127.0.0.1) 0.98ms
Could not open static file '/usr/share/jupyter/nbconvert/templates/base/static/jupyter-flex-embed.js'
404 GET /voila/templates/flex/static/jupyter-flex-embed.js (127.0.0.1) 1.00ms

The python environment created includes the following packages:

ipython==8.24.0
ipywidgets==8.1.2
Jinja2==3.1.4
jupyter_core==5.7.2
jupyter_server==2.14.0
nbclient==0.7.4
nbconvert==7.16.4
voila==0.5.6

[jmp75]

Note that other custom dashboard templates such as voila-material seem to work fine on the example notebooks.

using a separate mamba activate my_environment (albeit with voila 0.4.4)

voila --template material --VoilaConfiguration.file_whitelist '.*' nba-scoring.ipynb

A note, which may be a red herring, unrelated to the above issue, but while the dashboard seems to work, the comman dline reports

404 GET /voila/files/voila/jupyterlab-plotly.js (127.0.0.1) 0.40ms

This is despite installing mamba install plotly jupyterlab-plotly-extension

The python package jupyter-flex seems to have the same type of material under ./python/share/jupyter/nbconvert/templates/flex/static/ as voila-material. Note that jupyter-flex-embed.css and jupyter-flex-embed.js seem to be generated by the build process (not commited). Why the css and js template resources are not found the same way is beyond me.