The Solution worked for me: =======================
**Running the below commands solved the issue for me!**
conda install -c conda-forge notebook conda install -c conda-forge jupyter_contrib_nbextensions jupyter contrib nbextension install --user jupyter nbextensions_configurator enable --user

Solution worked for me: =======================
**Running the below commands solved the issue for me!**
conda install -c conda-forge notebook conda install -c conda-forge jupyter_contrib_nbextensions jupyter contrib nbextension install --user jupyter nbextensions_configurator enable --user