I am not able to install extensions like ipywidgets or ipyleaflet. For 
example,

    pip install ipywidgets --user

works, however, 

    jupyter nbextension enable --py widgetsnbextension

results in
    
    Unrecognized JSON config file version, assuming version 1
    Enabling notebook extension jupyter-js-widgets/extension...
      - Validating: problems found:
        - require?  X jupyter-js-widgets/extension

Similarly, after succesfull installation with pip, I am not able to enable 
ipyleaft:

    jupyter nbextension enable --py ipyleaflet

gives

    Unrecognized JSON config file version, assuming version 1
    Enabling notebook extension jupyter-leaflet/extension...
      - Validating: problems found:
        - require?  X jupyter-leaflet

Any help would be appreciated. Thank you!

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