title: Invalid block tag. Did you forget to register or load this tag?
body: <p>Getting an invalid block tag message <code>Invalid block tag on line 2: 'out'. Did you forget to register or load this tag?</code> but don't know why. Here's my setup:</p>
  
  <p>graphs.html</p>
  
  <pre><code>{% out %}
  </code></pre>
  
  <p>views.py</p>
  
  <pre><code>out = 'something to say'
  template = loader.get_template('viz_proj/graphs.html')
  context = {
      'out' : out
  } 
  return HttpResponse(template.render(context, request))
  </code></pre>
  
  <p>settings.py</p>
  
  <pre><code>INSTALLED_APPS = [
  'django.contrib.admin',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'viz_proj'
  ]
  </code></pre>
  
  <p>project heirarchy</p>
  
  <pre><code>viz_proj
  |
  viz_proj----------------------------------------templates
      |                                              |
      settings.py--views.py--urls.py               graphs.html
  </code></pre>