Django App ImproperlyConfigured: The app module has multiple filesystem locations

I met a error info as below: 

    Django App ImproperlyConfigured: The app module has multiple filesystem locations

 

The problem was that I deleted a __init__.py file. Apparently, django uses them to know which folders are packages, so they are kind of important.

 

参考文件：https://stackoverflow.com/questions/28205264/django-app-improperly-configured-the-app-module-has-multiple-filesystem-locati