django-scheduler: NoReverseMatch Exception

I have the following exception when I try to view the calender.

Request Method: GET
Request URL: http://0.0.0.0:8000/admin/r/11/3/

Django Version: 1.8.2
Python Version: 2.7.6
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'app',
 'schedule')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in wrapper
  254.                 return self.admin_view(view, cacheable)(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in inner
  233.             return view(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/contenttypes/views.py" in shortcut
  31.     absurl = get_absolute_url()
File "/usr/local/lib/python2.7/dist-packages/schedule/models/calendars.py" in get_absolute_url
  187.         return reverse('calendar_home', kwargs={'calendar_slug': self.slug})
File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py" in reverse
  579.     return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py" in _reverse_with_prefix
  496.                              (lookup_view_s, args, kwargs, len(patterns), patterns))

Exception Type: NoReverseMatch at /admin/r/11/3/
Exception Value: Reverse for 'calendar_home' with arguments '()' and keyword arguments '{u'calendar_slug': u'test'}' not found. 0 pattern(s) tried: []```