title: Start celery worker throws "no attribute 'worker_state_db'"
body: <p>When I am trying to start celery worker in Django app as:</p>
  
  <pre><code>celery -A myApp worker -l info
  </code></pre>
  
  <p>I get following error:</p>
  
  <pre><code>File "/home/alexander/.pyenv/versions/3.5.1/envs/myApp/lib/python3.5/site-packages/celery/utils/collections.py", line 134, in __getattr__
      type(self).__name__, k))
  
      AttributeError: 'Settings' object has no attribute 'worker_state_db'
  </code></pre>
  
  <p>If you know how to solve it please write your idea!</p>