add MessageMiddleware which is needed for the admin system

pyweb/settings.py

@@ -243,6 +243,7 @@ MIDDLEWARE_CLASSES = (
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.middleware.locale.LocaleMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware'
 )
 
 ROOT_URLCONF = 'pyweb.urls'