Error while installing Jupyterhub

I installed pip install jupyterlab from jupyter notebook then uninstalled it using pip uninstall jupyterlab. Now the notebooks are not spawning. How to resolve this?

You aren’t mentioning versions here, which may be important and always good practice.
Current JupyterLab and Jupyter Notebook 7+ use the same components. By uninstalling JupyterLab, maybe it removed critical, shared infrastructure? Did you then try uninstalling Jupyter Notebook and then clean things out thoroughly and then try reinstalling?

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