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

I am new to Django. I am trying to run an app and I need to add a new user to admin. The server is running. When I enter the info fir the new user and hit "save" I get the error below. I am using django-trunk.

MessageFailure at /admin/auth/user/add/
You cannot add messages without installing
django.contrib.messages.middleware.MessageMiddleware

Request Method: POST
Request URL:    http://localhost:8000/admin/auth/user/add/
Django Version: 1.6.dev20130403090717
Exception Type: MessageFailure
Exception Value:    You cannot add messages without installing django.contrib.messages.middleware.MessageMiddleware

Any ideas of what might be happening?