title: need help solving sorl-thumbnail error: "'thumbnail' is not a valid tag library:"
body: <p>I've been pulling my hair out trying to solve this problem and I've tried everything and I have no ideas left. </p>
  
  <p>I keep seeing this error:
  Exception Value: 'thumbnail' is not a valid tag library: Could not load template library from django.templatetags.thumbnail, No module named sorl.thumbnail.main</p>
  
  <p>$DJANGO_PACKAGES/sorl/thumbnail/main.py DOES exist.</p>
  
  <p>Here's what I did to setup,</p>
  
  <ol>
  <li><p>downloaded latest sorl-thumbnail and added its location to the python path in .bash_profile</p></li>
  <li><p>included 'sorl.thumbnail' in INSTALLED_APPS (in django's settings.py)</p></li>
  <li><p>used the {% load thumbnail %} tag in a django template</p></li>
  </ol>
  
  <p>It would seem obvious sorl-thumbnail is not installed correctly, but I'm able to import thumbnail from the python shell and the django shell (when I use {% load thumbnail %} it brings this error). Also, there are no typos in related files (I've checked many many times).</p>