django – Error while importing RTResource

I am working on a django project and am having trouble importing RTRsource from rtkit.
So when I try to import this on my models.py from rtkit.resource, import RTResource and then run the server that I got this:

File "/home/dorin/django-apps/myProject/polls/models.py", line 6, in 
from rtkit.resource, import RTResource
File "/home/dorin/django-apps/env/lib/python3.5/site-packages/rtkit/resource.py", line 10, in 
from rtkit.parser, import RTParser
File "/home/dorin/django-apps/env/lib/python3.5/site-packages/rtkit/parser.py", line 5, in 
from itertools import ifilterfalse
ImportError: Unable to import the name "ifilterfalse"

I've already tried to import RTParser and ifilterfalse separately and this keeps giving me the same mistakes.

Help me! I really need that to keep working on my project