import error in django_test_manage.py

I just upgraded to PyCharm 2.7 and am now unable to debug my unit tests. When I run them, I am taken to django_test_manage.py, line 6 with an import error (Unresolved reference):

from importlib import import_module

Below is a screenshot of my test config (one of the Django tests)

Anybody know how to fix this?
Thanks,

• Cam