title: ImportError: No module named django_extensions
body: <p>I am completely new to python as well as to Django. I got a sample Django Rest project. When I run: </p>
  
  <pre><code>python manage.py makemigrations
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>ImportError: No module named django_extensions
  </code></pre>
  
  <p>How can I solve this?</p>
  
  <p>I am running it in a virtualenv</p>