Some problems installing Nbextensions


I’m trying to use Jupyter 6.2.0 within an Anaconda environment running on Windows 10 (I use Google Chrome as my browser). I tried to install Nbextensions, but this seems to have partly failed. First, I can’t see any nbextensions tab that would enable me to configure the extension. Second, Anaconda comes up with the following error messages when I launch Jupyter (note: Jupyter still launches):

[W 19:23:56.685 NotebookApp] Error loading server extension jupyter_nbextensions_configurator
Traceback (most recent call last):
File “C:\Users\probi\anaconda3\envs\branch-env\lib\site-packages\notebook\”, line 1988, in init_server_extensions
mod = importlib.import_module(modulename)
File “C:\Users\probi\anaconda3\envs\branch-env\lib\”, line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 1006, in _gcd_import
File “”, line 983, in _find_and_load
File “”, line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named ‘jupyter_nbextensions_configurator’
[I 19:23:56.687 NotebookApp] Serving notebooks from local directory: C:\Users\probi
[I 19:23:56.687 NotebookApp] Jupyter Notebook 6.2.0 is running at:
[I 19:23:56.687 NotebookApp] http://localhost:8888/?token=b8eb6c11f8186ff50be664b6596cfb35ec831cd2a60b48ab
[I 19:23:56.687 NotebookApp] or
[I 19:23:56.687 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 19:23:56.759 NotebookApp]

Is there anything I might have done wrong while installing NbExtensions? Otherwise, can somebody help me fix this problem?