Error message of Python tool

[HMSUM]

When I use Python tool in Alteryx, it always show the following message:

The error was:

TypeError: Cannot read property 'split' of null

See the error console for details.

The notebook also failed validation:

Notebook validation failed: None is not valid under any of the given schemas:
null

Are there any solution to avoid this message, every time before I run the app, I need to click and open the jupyter notebook and press "OK", which is so disturbing.

(Attached screen cap for reference)

[SophiaF · Accepted solution]

@HMSUM I'm very sorry to see you are running into issues with this tool - I have not seen this specific error before, but the behavior suggests to me you should try the steps in this article: How to reset the Python tool