502 Bad Gateway when opening ipython notebooks

I am unable to open existign notebooks or create one. Thank you for your help. This is what I get :

Thanks for letting us know -- we're investigating.

It looks like you've somehow managed to install some Python 2.7 code into your .local directory for Python 3.4; when the notebook system tries to start up, it runs Python 3.4 in the context of your Python environment, so that's making it crash.

If you remove the directory /home/moibnj/.local/lib/python3.4/site-packages/concurrent/ then that should fix the problem.

It works fine now, thank you !!!

Excellent, thanks for confirming!

Im having this exact problem. Should i delete the same folder?

Hi there, we're just looking into this issue now, will keep you posted...

give it another go now?

Thanks it's working again now :)

Excellent, thanks for confirming!