No module named static files

[nbro]

I am trying to install this plug-in, but I am having a problem:

 raise ImproperlyConfigured('ImportError %s: %s' % (app, e.args[0]))
django.core.exceptions.ImproperlyConfigured: ImportError staticfiles: No module named 'staticfiles'

I have added the string staticfiles to the INSTALLED_APPS.

Since I am newbie with djangocms, I don't know what could be the problem.