Python Error: No module named activatable_model.tests.migrations.0002_activatablemodelwrelandcascade

This is probably because you don't have package django_activatable_model installed.

You can install it in command line via pip:

        pip install django_activatable_model
      

Install specific version:

        pip install "django_activatable_model==1.2.1"
      

Get more info about package via pypi.org: django_activatable_model