title: No module named 'model_utils'
body: <p>I'm using Python 3.4.3 and django 1.9.8.</p>
  
  <p>In my models.py, I have</p>
  
  <blockquote>
    <p>from model_utils.managers import InheritanceManager</p>
  </blockquote>
  
  <p>But this error occurs:</p>
  
  <blockquote>
    <p>ImportError: No module named 'model_utils'</p>
  </blockquote>