Jupyter notebook always busy

Hi all, my jupyter notebook suddenly stopped working and there is a hourglass icon in my tab. Anyone know what’s wrong? I tried restarting my jupyter notebook and also restarting my laptop, nothing worked. Thank you for your help!

Did you start Jupyter Notebook from the shell? Maybe there you can see an error message.

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thank you for your reply!

I saw a post on stackoverflow saying this is due to the version of prompt-toolkit? I try to run pip3 install 'prompt-toolkit<2.1.0,>=2.0.0' --force-reinstall, but still not working.

Sorry, I have no experience with this error