Q: Can't start up Jupyter Lab on MacOS

Question

Trying to start Jupyter Lab using jupyter lab gives the following error:

AttributeError: 'ExtensionManager' object has no attribute '_extensions'

In case this has anything to do with Python, I am using version 3.9.5 installed through Homebrew.

> which python3
python3: aliased to /usr/local/bin/python3
> python3 --version
Python 3.9.5

I installed Jupyter using pip3.

I am able to use jupyter notebook and jupyter console, however. Only jupyter lab results in this error message.

Answer 1

You can either update nbclassic as krassowski mentioned or disable the extension nbclassic until the bug is fixed.

In my case, updating nbclassic did not work on Apple M1. So, I had to disable it using -

jupyter server extension disable nbclassic