Jupyter Notebook Extensions Fail to Load

Question

I am running Ubuntu 14.04 in virtual box with a recent anaconda install. I installed jupyter notebooks using conda. I have followed all of the documentation that I can find online to install notebook extensions but they fail to load with the error messages listed below. The first error is from the jupyter notebook app running in a terminal and the second error is in the chrome java console. Notice that I cannot post this question with this many hyperlinks so I remove the "p" from "http" in my error messages.

[W 07:02:06.451 NotebookApp] 404 GET /nbextensions/python-markdown.js?v=20150904070147 (127.0.0.1) 8.47ms referer=htt://localhost:8888/notebooks/Untitled.ipynb

htt://localhost:8888/nbextensions/python-markdown.js?v=20150904070147 Failed to load resource: the server responded with a status of 404 (Not Found)

To detail my installation method: I cloned the git repository [IPython-notebook-extensions][1] and used the command jupyter-nbextension install python-markdown inside the IPython-notebook-extensions/usability/ folder. I then enabled the extension with jupyter-nbextension enable python-markdown. I ran these commands as superuser as well.

After this failed I installed this extension inside python (from the usability/ directory of the repository) using:

import notebook
notebook.install_nbextension('python-markdown',user=True)
E=notebook.nbextensions.EnableNBExtensionApp()
E.enable_nbextension('python-markdown')

I also tried this as the superuser without the parameter user=True.

I have confirmed that the files copied to both /usr/local/share/jupyter/nbextensions/python-markdown and ~/.local/share/jupyter/nbextensions/python-markdown. The extension is enabled in the ~/.jupyter/nbconfig/notebook.json file. Finally, I also deleted the chromium and mozilla cache (by deleting the folders in the ~/.cache directory) multiple times while trying this.

Answer 1

Solved here: https://github.com/ipython-contrib/IPython-notebook-extensions/issues/282. The ~/.jupyter/nbconfig/notebook.json file must be edited to use python-markdown/main instead of python-markdown.

Answer 2

More generally this kind of error can also happen after you've upgraded Jupyter/Python/etc and some of the extensions are not supported by your updates. You can then just disable them from the Nbextensions configuration tab - you may find that they're the extensions that are shown as incompatible - which can be disabled by ticking the 'disable configuration for nbextensions without explicit compatibility' checkbox.