Invalid notebook for chapter 3

[nfaraji2002]

Hello,

I encountered this error when opening chapter 3 notebooks:

There was an error rendering your Notebook: the 'state' key is missing from 'metadata.widgets'. Add 'state' to each, or remove 'metadata.widgets'.

How can I solve it?
Thanks,

Neda

[Br4dski]

Hi nfaraji2002,

I'm getting the same issue, did you manage to resolve it?

I was accessing chapter 02 fine, but cpt 03 isn't working!

Cheers
Brad

[Br4dski]

Snip of the error message attached