You cannot add messages without installing django.contrib.messages.middleware.MessageMiddleware

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Everything installed and ran fine, but when I tried to edit something in the admin settings, I'd get this error:

You cannot add messages without installing django.contrib.messages.middleware.MessageMiddleware

I did a quick search and found that "django.contrib.messages" was in the INSTALLED_APPS, but "django.contrib.messages.middleware.MessageMiddleware" was missing from the MIDDLEWARE_CLASSES.

Is that a bug or did I configure something incorrectly somehow? Once I added "django.contrib.messages.middleware.MessageMiddleware" to the MIDDLEWARE_CLASSES I was able to save my settings.