Error: gunicorn: Failed to find application object 'app' in 'app'

You have a folder called app (as by the import lines in your file) and a app.py file.

Gunicorn will try to find the app WSGI variable inside the app module, which in your case is identified as app/__init__.py

You need to rename your folder or your app.py file to avoid this conflict.

I found that this bug only happens on gunicorn version 20+. When I downgrade to version 19.9.0, it works fine even with the folder and app.py sharing the same name.