Getting "Internal Server Error" with non-contrib `staticfiles` and DEBUG=True

[crccheck]

If you are using Django + django-staticfiles + DEBUG=True, then you get a generic "Internal Server Error".

If you dig down, the error raised is:

Finder "<class 'staticfiles.finders.FileSystemFinder'>" is not a subclass of "<class 'django.contrib.staticfiles.finders.BaseFinder'>"

The solution is to use django.contrib.staticfiles instead of staticfiles.

Opening and closing in case anyone else runs into this.