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Unable to launch : ipython notebook

I have the following message : 503: Proxy Target Missing Thank you for your help Here is what I get :

deleted-user-1802663 | 20 posts | Jan. 21, 2018, 5:24 p.m. | permalink

Hi there, can you try again now?

Staff harry | 2710 posts | PythonAnywhere staff | Jan. 22, 2018, 10:24 a.m. | permalink

Hi, I just tried again, same pb. But I'm in the tarpit, is it related ?

deleted-user-1802663 | 20 posts | Jan. 22, 2018, 10:40 a.m. | permalink

normally you should get a different error if you're in the tarpit...

can you try heading over to the Consoles tab, do a "fetch process list", and delete any jupyterhub processes, then try again?

Staff harry | 2710 posts | PythonAnywhere staff | Jan. 22, 2018, 10:42 a.m. | permalink

I still have the pb, and when I fetch process list I have nothing running

deleted-user-1802663 | 20 posts | Jan. 22, 2018, 2:48 p.m. | permalink

Will you give it one more try? I've assumed your instance got corrupted somehow and switched you to a different notebook server...

Staff harry | 2710 posts | PythonAnywhere staff | Jan. 22, 2018, 6:20 p.m. | permalink

So, I had a page suggesting to refresh the server, with a button which I clicked. Then the same error occurred.

deleted-user-1802663 | 20 posts | Jan. 22, 2018, 6:34 p.m. | permalink

Ah, I think I've tracked it down. It looks like you might have installed the traitlets and notebook packages for Python 3.4 for your account using pip3.4 install --user, and the versions you've installed are not compatible with the version of JupyterHub we're using.

If you do pip3.4 uninstall notebook and pip3.4 uninstall traitlets, that should fix the version clash and it should start working again.

Staff giles | 12074 posts | PythonAnywhere staff | Jan. 22, 2018, 8:08 p.m. | permalink