Jupyter method not allowed: why does this flag appear in my notebook menu?

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I'm starting to learn Python and I'm currently following a MOOC using Jupyter, which seems to be a great tool. It's composed of several questions, each one requiring to write a piece of code.

I submit my code on a regulary basis so I know that this particular notebook works. But now I have an orange "Method not allowed" flag top right on my browser:

                                      enter image description here

When I click on it it disappears for a while and then come back. All code chunks are executed without any error.

How could I get informations about how to solve this issue ?

EDIT : It wasn't about the code written in the notebook. See answer below.

Thanks :)

jupyter-notebook python
2 Answers

I had the same problem (the orange 'method not allowed' message was appearing, and autosave and save were failing). Seems like it might be caused by an expired session as suggested by kdallaporta.

A solution that avoids reloading (as suggested by kdallaporta) and possible data loss is the following (this worked for me in a coursera notebook): log out and then log in from another window, and then open a new copy of the notebook (without closing the original notebook). The original notebook should work again without the problems above, and the new copy can be closed.

user_106103620
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