STATICFILES_STORAGE/STORAGES are mutually exclusive

[Malik Rumi]

I am getting this error, consistently and repeatedly, despite having taken the old STATICFILES_STORAGE setting out of my settings.py. I have been looking for a solution, and the source of this problem. I was at the Django repo on Github just now, looking at 

django/conf/global_settings.py, when I was startled to see both the new STORAGES dict (line 274) AND the old STATICFILES_STORAGE (line 630) in the same file.

How is that possible when the rest of us are getting this mutually exclusive error?

And, of course, how do I get out of this error?

Thx.