KeyError at /admin/banner_rotator/campaign/add/ #17
Description
when i add campaign i got this error
Python Version: 2.7.11
Django Version: 1.8.9
Exception Type: KeyError
Exception Value: u'manager'
Error during template rendering
In template /Users/storm/dev/env/lib/python2.7/site-packages/django/contrib/admin/templates/admin/includes/fieldset.html, error at line 17
17 row:
{{ field.contents }}
how to fix it?