Add django MessageMiddleware

dpdapisite/settings.py

@@ -46,6 +46,7 @@ MIDDLEWARE = [
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
 ]
 
 ROOT_URLCONF = 'dpdapisite.urls'