error running a script - HELP

hi everyone, i'm new to this all python thing. I am trying to run a script i found at Github, but i keep getting this error: ModuleNotFoundError: No module named 'facebook'

i have checked previous advises in this topic that had suggested i'd open a new bash and use pip3.6 install --user pwhich. i did that but the problem remains... any ideas ?

Here is a debugging guide that I created. I would appreciate any feedback!