help with gempy_viewer

[ljapril]

Hello,
I downloaded the Greenstone jupyter notebook and was trying to run it but I am getting a Module Not Found Error:

Could someone explain why this is happening?
Thank you.

[javoha]

Hi,
how did you install gempy? It looks like you just did not install gempy_viewer. I would recommend to use:
pip install gempy[opt]
That makes sure you have the crucial packages, namely gempy, gempy_viewer and gempy_engine.
Cheers
Jan