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ipywidgets will not work in AEN 4.2.x

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Issue

When you try to access ipywidgets from Jupyter Notebook in AEN:

from ipywidgets import *
IntSlider()


You may see the following error:

Widget Javascript not detected. It may not be installed or enabled properly.


Cause

There is a mismatch in the widgetsnbextension version shipped with the compute.

Solution

It is a known issue in AEN 4.2.x.

To fix this issue, run the following command from your AEN server:

sudo -u aen_admin /opt/wakari/anaconda/bin/conda install -p /opt/wakari/wakari-compute/ widgetsnbextension=2

Replace /<aen_admin> with your AEN account.

Or run the following command from your AEN server:

cd /opt/wakari/wakari-compute
which jupyter
/opt/wakari/anaconda/bin/jupyter
jupyter nbextension enable --py --sys-prefix widgetsnbextension


You will see the following result:

Enabling notebook extension jupyter-js-widgets/extension...
      - Validating: OK