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I have the following message : 503: Proxy Target Missing Thank you for your help

Hi there, can you try again now?

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

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?

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

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

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

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.