Not able to see the jupyter_nbextensions_configurator

[EnricowithR]

I upgraded jupyter_nbextensions_configurator to 0.4.1
then I run again:
jupyter nbextensions_configurator enable --user

However at the following page:
http://localhost:8888/tree
the extensions is not visible yet.

Also if I try to access to
http://localhost:8888/custom/base/url/nbextensions
or
http://localhost:8888/custom/base/url/tree
it returns:
404 : Not Found
You are requesting a page that does not exist!

What can be done to make it visible?

[juhasch]

The standard url is http://localhost:8888/nbextensions, unless you habe changed the baseurl configuration. Did you try that ?

[EnricowithR]

I tried it and it gives the same not found error

[juhasch]

Do you see [jupyter_nbextensions_configurator] enabled 0.4.1 in the log when starting the notebook ?

[EnricowithR]

no, and in the logs I see this message:
404 GET /nbextensions/widgets/notebook/js/extension.js (::1) 2.61ms referer=http://localhost:8888/notebooks/Desktop...

what should I do to active it?

[juhasch]

1. try python -c "import jupyter_nbextensions_configurator". If you get an error, the configurator is not installed.
2. try jupyter-serverextension list. It should look like this:

config dir: /home/juhasch/.jupyter
    jupyter_nbextensions_configurator  enabled 
    - Validating...
      jupyter_nbextensions_configurator 0.4.1 OK

If not, the extension was not installed properly.

You might want to create a new virtualenv or conda environment (depending on your installation) and try reinstalling in a fresh setup.

[EnricowithR]

1. the first command returns:
   No module named 'jupyter_nbextensions_configurator'

2. and the second one returns:
   jupyter_nbextensions_configurator enabled

   • Validating...
     jupyter_nbextensions_configurator 0.4.1 OK
     config dir: /anaconda3/etc/jupyter
     jupyterlab enabled
   • Validating...
     jupyterlab 0.27.0 OK

How is it possible that the extension appears as enabled but the module is not found?

[juhasch]

You likely installed the configurator package in your base environment and not in your current one.

[EnricowithR]

Right, that was the case. I fixed it following the suggestions from here:
ipython-contrib/jupyter_contrib_nbextensions#1115