No module named rest_auth

You have to install django-rest-auth :

pip install django-rest-auth

You may encounter some problems on MacOS which it seems you can fix following this :

• Unable to install nltk on Mac OS El Capitan

Or this :

• "OSError: [Errno 1] Operation not permitted" when installing Scrapy in OSX 10.11 (El Capitan) (System Integrity Protection)

Second one seems not to be very system friendly, try first, first.