Notebooks aren't working

Module 1. The Predictive Modeling Pipeline Wrap-up quiz
#1

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what should is do to solve this problem?
all notebooks are notr working

#2

It works for me, could you please try again ?

#3

i restarted my PC and changed the browser, nothing have changed
pleas, what should i do then?

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#4

I’m getting the same…

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#5

Yes,Jupyterhub is down. You can follow this post to be informed : Jupyterhub is down - #2

#6

It’s back and running now. See Jupyterhub was down but it is back and running now - #4 by lfarhi to have more information.