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Showing content from https://github.com/Jupyter-contrib/jupyter_nbextensions_configurator/issues/11 below:

[jupyterhub] 404 on nbextensions/nbextensions_configurator · Issue #11 · Jupyter-contrib/jupyter_nbextensions_configurator · GitHub

I'm on jupyterhub. I'm trying to us the configurator on latest versions of everything (Aug 19, 2016). I have installed everything according to README, and it shows as enabled (as root):

# jupyter-nbextension list
Known nbextensions:
  config dir: /root/.jupyter/nbconfig
    notebook section
      dragdrop/main  enabled 
      - Validating: OK
  config dir: /opt/anaconda3/etc/jupyter/nbconfig
    notebook section
      calysto/cell-tools/main  enabled 
      - Validating: OK
      jupyter-js-widgets/extension  enabled 
      - Validating: OK
      codefolding/main disabled
      nbextensions_configurator/config_menu/main  enabled 
      - Validating: OK
      calysto/spell-check/main  enabled 
      - Validating: OK
      calysto/submit/main  enabled 
      - Validating: OK
      calysto/document-tools/main  enabled 
      - Validating: OK
      calysto/publish/main  enabled 
      - Validating: OK
    tree section
      ipyparallel/main  enabled 
      - Validating: OK
      nbextensions_configurator/tree_tab/main  enabled 
      - Validating: OK

However, when I load the notebook (after restarting jupyterhub) the tab shows, it is empty and I get the following error in the Javascript console:

Why is the URL giving a 404? Maybe I didn't install the app properly for jupyterhub? Any hints?

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