Update example middleware

example/settings.py

@@ -58,7 +58,7 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-    'django.middleware.cache.FetchFromCacheMiddleware',
+    'cms.middleware.FetchFromCacheMiddleware',
 ]
 
 TEMPLATES = [