conda tab doesn't work

I just recorded a screencast of this problem: http://screencast.com/t/jnBVQlce4

In short:

1. I created a conda env with:

   conda create -n testaen -c anaconda-nb-extensions -c r -c wakari nb_conda nb_conda_kernels r-essentials
   

2. I entered that conda environment to run conda:

   source activate testaen
   jupyter notebook
   

3. I started Jupyter and then tried to go to the Conda tab. I get the error shown in the 2 minute video above. The full log from the start of Jupyter is below:

$ jupyter notebook
[W 16:03:52.822 NotebookApp] Widgets are unavailable. Please install widgetsnbextension or ipywidgets 4.0
[I 16:03:52.832 NotebookApp] The port 8888 is already in use, trying another port.
[I 16:03:52.843 NotebookApp] Serving notebooks from local directory: /Users/ijstokes/code/aetrial/files/assets
[I 16:03:52.843 NotebookApp] 0 active kernels 
[I 16:03:52.843 NotebookApp] The Jupyter Notebook is running at: http://localhost:8889/
[I 16:03:52.843 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[W 16:04:04.164 NotebookApp] Notebook simon/Flight delays R model.ipynb is not trusted
[I 16:04:04.921 NotebookApp] Kernel started: d0272f60-34bb-4fc8-b256-c51a25cf23a2
[W 16:04:05.358 NotebookApp] 404 GET /nbextensions/widgets/notebook/js/extension.js?v=20160418160352 (::1) 17.64ms referer=http://localhost:8889/notebooks/simon/Flight%20delays%20R%20model.ipynb
[I 16:06:04.761 NotebookApp] Saving file at /simon/Flight delays R model.ipynb
[W 16:06:04.762 NotebookApp] Saving untrusted notebook simon/Flight delays R model.ipynb
[W 16:06:44.134 NotebookApp] 404 GET /environments?_=1461009837436 (::1) 2.19ms referer=http://localhost:8889/tree/simon
[W 16:06:44.136 NotebookApp] 404 GET /packages/available?_=1461009837437 (::1) 0.93ms referer=http://localhost:8889/tree/simon
[W 16:07:08.330 NotebookApp] 404 GET /environments?_=1461009837441 (::1) 1.39ms referer=http://localhost:8889/tree/simon
[W 16:07:08.332 NotebookApp] 404 GET /packages/available?_=1461009837442 (::1) 1.39ms referer=http://localhost:8889/tree/simon

[dankrause]

I ran into this issue myself (404s on /environments and /packages) on a fresh install. Here’s the output of jupyter serverextension list

config dir: /home/py/anaconda3/etc/jupyter
    nbpresent  enabled 
    - Validating...
      nbpresent  OK
    nb_conda  enabled 
    - Validating...
      nb_conda  OK
    nb_anacondacloud  enabled 
    - Validating...
      nb_anacondacloud  OK

I then ran the following commands:

jupyter serverextension disable nb_conda
jupyter serverextension enable nb_conda

Before running these commands, ~/.jupyter/jupyter_notebook_config.json did not exist. After these operations, it did exist, with the following contents:

{
  "NotebookApp": {
    "nbserver_extensions": {
      "nb_conda": true
    }
  }
}

This caused nb_conda to start working properly. When I move that file out of the way by renaming it, nb_conda starts failing again, even though the output of jupyter serverextension list is unchanged.

[damianavila]

The original issue seems related with some failures when you install nb_conda alongside with some jupyter-contrib extensions. That will be further researched on #41

There is second issue related with some configs in the user space conflicting with the config we use at the sys-prefix… that could be investigated later in the following issue: #49

Finally, there is some issue related with jupyterhub, that will follow up in the this issue: #50

Closing this one now.