Running a Jupyter Lab kernel under Python 3.6 (possibly also 3.7) throws:
AssertionError: Couldn't find Class NSProcessInfo
Running in Python 3.8 works fine.
Apparently this issue occurs only on Mac with Big Sur OS. This issue was filed for correction but you can work around it by installing the Jupyter Lab using pip instead of conda.
pip install jupyterlab
See this reference: https://github.com/jupyterlab/jupyterlab/issues/9410
If you use Conda environment, create with python 3.7 version at first. and install the jupyterlab with pip
(Example: "rdkit" environment)
conda create -n rdkit python=3.7.9
conda activate rdkit
pip install jupyterlab
# and then
jupyter lab --ip=0.0.0.0 --port=8800 --no-browser
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