Jupyter conda tab 'An error occurred while retrieving package information.'

Question

In my root environment I run

$ jupyter notebook

and in the browser, click on the 'Conda' tab. This always used to list my conda environments and the packages in them. Now I'm greeted by the following error.

I recently created and deleted some conda environments, maybe that is relevant. The only console output is

[W 10:30:20.948 NotebookApp] 404 GET /environments?_=1476811818902 (::1) 13.19ms referer=http://localhost:8888/tree
[W 10:30:20.951 NotebookApp] 404 GET /packages/available?_=1476811818903 (::1) 1.77ms referer=http://localhost:8888/tree

Answer 1

See this issue: https://github.com/Anaconda-Platform/nb_conda/issues/23

The issue seems to be a conflict between the notebook config file in the conda environment and the config file in the users directory.

To fix the issue and get the tab to display properly the content, I had to remove that file:

rm jupyter_notebook_config.json in ~/.jupyter

Note that, for me, that was not an issue as it did not really contain anything.

Answer 2

As pointed out at: https://github.com/Anaconda-Platform/nb_conda/issues/23#issuecomment-239813091

The following command helped in resolving the issue:

jupyter serverextension disable nb_conda
jupyter serverextension enable nb_conda

This basically rewrites the config file in the ~/.jupyter folder.