old_contents: from django.apps import AppConfig
  from django.utils.translation import ugettext_lazy as _
  from django.core.exceptions import ImproperlyConfigured
  
  
  class DjangaeConfig(AppConfig):
      name = 'djangae'
      verbose_name = _("Djangae")
  
      def ready(self):
          from djangae.db.backends.appengine.caching import reset_context
          from django.core.signals import request_finished, request_started
  
          request_finished.connect(reset_context, dispatch_uid="request_finished_context_reset")
          request_started.connect(reset_context, dispatch_uid="request_started_context_reset")
  
          from django.conf import settings
          if 'django.contrib.contenttypes' in settings.INSTALLED_APPS and (
                  not 'djangae.contrib.contenttypes' in settings.INSTALLED_APPS):
              raise ImproperlyConfigured(
                  "If you're using django.contrib.contenttypes, then you need "
                  "to add djangae.contrib.contenttypes to INSTALLED_APPS after "
                  "django.contrib.contenttypes."
              )
  
new_contents: from django.apps import AppConfig
  from django.utils.translation import ugettext_lazy as _
  from django.core.exceptions import ImproperlyConfigured
  
  
  class DjangaeConfig(AppConfig):
      name = 'djangae'
      verbose_name = _("Djangae")
  
      def ready(self):
          from djangae.db.backends.appengine.caching import reset_context
          from django.core.signals import request_finished, request_started
  
          request_finished.connect(reset_context, dispatch_uid="request_finished_context_reset")
          request_started.connect(reset_context, dispatch_uid="request_started_context_reset")
  
          from django.conf import settings
          contenttype_configuration_error = ImproperlyConfigured(
              "If you're using django.contrib.contenttypes, then you need "
              "to add djangae.contrib.contenttypes to INSTALLED_APPS after "
              "django.contrib.contenttypes."
          )
          if 'django.contrib.contenttypes' in settings.INSTALLED_APPS:
              if not 'djangae.contrib.contenttypes' in settings.INSTALLED_APPS:
                  # Raise error if User is using Django CT, but not Djangae
                  raise contenttype_configuration_error
              else:
                  if settings.INSTALLED_APPS.index('django.contrib.contenttypes') > \
                          settings.INSTALLED_APPS.index('djangae.contrib.contenttypes'):
                      # Raise error if User is using both Django and Djangae CT, but
                      # Django CT comes after Djangae CT
                      raise contenttype_configuration_error
  
subject: Raise configuration error if django.contrib.contenttypes comes after djangae.contrib.contenttypes