404 GET

404 GET /nbextensions/widgets/notebook/js/extension.js?v=20170904163701

This error is driving me crazy! Uninstalled and reinstalled so many times. Definitely not being loaded via any jupyter config files. Are there any ipython config files that might be looking to load it on notebook load?

Also, there is no yaml spec, so the nbextensions_configurator from user-contrib is no help.

Any advice?

[soamaven]

@ahmadia Yes, thanks, I just came here to post a similar solution!

For anyone who may come after me. I am not sure if all steps are required, but they helped me narrow down the possible problem sources. Pretty sure only step 7 as above. So, perhaps just moving files to backups is a more appropriate strategy and slowly adding them back to their proper paths, e.g. mv ~/.jupyter ~/.jupyter.bak is better than rm ~/.jupyter

1. Uninstalled jupyter-contrib-nbextensions, ipywidgets, ipython_genutils, from the target conda environment. Uninstalled ipywidgets from everywhere, system, user, and sys-prefix.

2. Removed the jupyter_contrib_nbextensions config files ( common.json, edit.json, tree.json, terminal.json, notebook.json, jupyter_nvconver_config.json) from /usr/local/share/jupyter/nbextensions and /usr/local/share/jupyter/nbextensions. Not sure the sub-directories, but a simple find /usr -name "*.json" should reveal them.

3. Removed my ~/.jupyter user config files in order to force use of the conda environment config files. Also made sure to target any extensions from the packages in 1 located in ~/.local/share/jupyter/nbextensions. I don’t have a ~/.ipython folder anymore, pretty sure that’s depricated, so that went too.

4. Manually edited (because I have other extensions I wanted to keep) the conda env config files (same as in step 2) in ~/anaconda3/envs/myenv/etc/jupyter/nbconfig to delete any reference to any of the jupyter-contrib-nbextensions or ipywidgets extensions, whether enabled or not. Watch out for trailing commas at the end of the json lists!

5. Reinstall all the things! conda install -c conda-forge jupyter_contrib_nbextensions ipywidgets

6. Enable jupyter_contrib_nbextensions things with jupyter contrib nbextension install --sys-prefix and jupyter nbextensions_configurator install --sys-prefix (shouldn’t be needed, but doesn’t hurt)

7. Enable ipywidgets as above with jupyter nbextension enable --py --sys-prefix widgetsnbextension. Pretty sure this was the magic step.

Thanks @jasongrout for your pleasantly persistent help!

[ahmadia]

I had similar problems, I fixed it with the following command:

jupyter nbextension enable --py --sys-prefix widgetsnbextension

The sys-prefix seemed to fix whatever issue the conda installer is having in getting the nbextension to properly register the Javascript.