title: ImproperlyConfigured: Middleware module "django.middleware.csrf" does not define a "CsrfResponseMiddleware" class
body: <p>I don't have this problem on my local development environment, but I just deployed the app with nginx + gunicorn (first time deploying an app) and I am getting this traceback whenever I try to make a request.</p>
  
  <pre><code>2012-01-21 22:24:36 [5712] [ERROR] Error handling request
  Traceback (most recent call last):
    File "/usr/lib/pymodules/python2.7/gunicorn/workers/sync.py", line 96, in handle_request
      respiter = self.wsgi(environ, resp.start_response)
    File "/usr/lib/python2.7/dist-packages/django/core/handlers/wsgi.py", line 219, in __call__
      self.load_middleware()
    File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 51, in load_middleware
      raise exceptions.ImproperlyConfigured('Middleware module "%s" does not define a "%s" class' % (mw_module, mw_classname))
  ImproperlyConfigured: Middleware module "django.middleware.csrf" does not define a "CsrfResponseMiddleware" class
  </code></pre>
  
  <p>The following is a part of my settings.py file</p>
  
  <pre><code>MIDDLEWARE_CLASSES = (
      'django.middleware.common.CommonMiddleware',
      'django.contrib.sessions.middleware.SessionMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
      'django.middleware.csrf.CsrfResponseMiddleware',
      'django.contrib.auth.middleware.AuthenticationMiddleware',
      'django.contrib.messages.middleware.MessageMiddleware',
  )
  </code></pre>
  
  <p>Anyone can point me in the right direction?</p>