Lesson 3: ModuleNotFoundError: No module named 'fast_gen'

I’m trying to run the planet_cv file for lesson 3 planet dataset but it shows module not found.
I tried searching on the internet and other approaches of ModuleNotFoundError, none of them seems to work.
Also, other previous notebooks are working properly.

Some details:

  1. Using Paperspace on MacOS
  2. No changes in the file directory structure

Any help would be appreciated. Thank you!