Error loading Jupyter Notebook Extensions

Question

I am using a Macbook with OS Sierra, and running Python 3.6.1 and Jupyter Notebook Server 5.0.0 I installed Jupyter Notebook extensions, following the instructions as mentioned on https://github.com/ipython-contrib/jupyter_contrib_nbextensions

While the notebooks work fine on my system, I cannot view the nbextensions tab. The following is the error log I see on running jupyter notebook in terminal. I have seen some related problems posted here on SO, but they seem to be about installing specific extensions.

Further, one of the solutions seemed to be suggest pip install jupyter_nbextensions_configurator, but as can be seen from the output below, I already have the extension installed.

Requirement already satisfied: traitlets in /usr/local/lib/python3.6/site-packages (from jupyter_nbextensions_configurator)
Requirement already satisfied: tornado in /usr/local/lib/python3.6/site-packages (from jupyter_nbextensions_configurator)

However, in the logs, you will notice that ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator' is one of the error messages.

[W 08:44:49.973 NotebookApp] server_extensions is deprecated, use nbserver_extensions
[W 08:44:50.146 NotebookApp] Error loading server extension jupyter_nbextensions_configurator
    Traceback (most recent call last):
      File "/usr/local/lib/python3.6/site-packages/notebook/notebookapp.py", line 1271, in init_server_extensions
        mod = importlib.import_module(modulename)
      File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/__init__.py", line 126, in import_module
        return _bootstrap._gcd_import(name[level:], package, level)
      File "<frozen importlib._bootstrap>", line 978, in _gcd_import
      File "<frozen importlib._bootstrap>", line 961, in _find_and_load
      File "<frozen importlib._bootstrap>", line 948, in _find_and_load_unlocked
    ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator'
[I 08:44:50.158 NotebookApp] Serving notebooks from local directory: /Users/sp
[I 08:44:50.158 NotebookApp] 0 active kernels
[I 08:44:50.158 NotebookApp] The Jupyter Notebook is running at: http://localhost:8888/?token=c777a7ab5dc6cf416c238b7b37f58d10ebea9db0743b46ae
[I 08:44:50.158 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 08:44:50.163 NotebookApp]

    Copy/paste this URL into your browser when you connect for the first time,
    to login with a token:
        http://localhost:8888/?token=c777a7ab5dc6cf416c238b7b37f58d10ebea9db0743b46ae
[I 08:44:51.633 NotebookApp] Accepting one-time-token-authenticated connection from ::1
[W 08:44:54.407 NotebookApp] 404 GET /nbextensions/nbextensions_configurator/tree_tab/main.js?v=20170511084449 (::1) 25.76ms referer=http://localhost:8888/tree

What am I missing here? Thanks!

Answer 1

I had the same problem. Here is how I solved it.

I have downloaded Anaconda python version 3.7. I already had Python 3.6.7 on my system.

I'd get this error if I did:

pip install jupyter_contrib_nbextensions

To solve it, I did:

python3.7 -m pip install jupyter_contrib_nbextensions

I have not tried this, but this could solve your problem too:

conda install -c conda-forge jupyter_nbextensions_configurator

So I guess the problem is because of there being multiple versions of Python on your system. The one which Anaconda uses and the one which the "normal pip" uses are probably different.

Answer 2

I solved this problem by removing jupyter-notebook, jupyter_contrib_nbextensions, and jupyter_nbextensions_configurator, and starting it from scratch.

Note: It only works on Anaconda environment.

Uninstallation

For the different source of installation, you can remove these package through:

pip uninstall jupyter
pip uninstall jupyter_contrib_nbextensions
pip uninstall jupyter_nbextensions_configurator

or

conda remove --force jupyter notebook
conda remove --force jupyter_nbextensions_configurator
conda remove --force jupyter_contrib_nbextensions

But I'd advise you to run both of the above commands.

Installation

It's better to install all the packages from anaconda:

conda update notebook
conda install jupyter notebook
conda install -c conda-forge jupyter_nbextensions_configurator
conda install -c conda-forge jupyter_contrib_nbextensions