title: Django upgrading to 1.9 error "AppRegistryNotReady: Apps aren't loaded yet."
body: <p>When upgraded to django 1.9 from 1.8 I got this error. I checked answers for similar questions, but I didn't think this is an issue with any 3rd party packages or apps.</p>
  
  <pre><code>Traceback (most recent call last):
  File "manage.py", line 10, in &lt;module&gt; execute_from_command_line(sys.argv)
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 350, in execute_from_command_line
  utility.execute()
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 342, in execute
  self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 176, in fetch_command
  commands = get_commands()
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/utils/lru_cache.py", line 100, in wrapper
  result = user_function(*args, **kwds)
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 71, in get_commands
  for app_config in reversed(list(apps.get_app_configs())):
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/apps/registry.py", line 137, in get_app_configs
  self.check_apps_ready()
  File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/apps/registry.py", line 124, in check_apps_ready
  raise AppRegistryNotReady("Apps aren't loaded yet.")
  django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.
  </code></pre>
  
  <p>I'd modified the Installed apps for 'django.contrib.auth'.</p>