Django-cms problem

I'm setting up a website using django-cms and when I open up the add page view in the a开发者_StackOverflowdmin, I get this error:

TemplateSyntaxError at /admin/cms/page/add/

Invalid block tag: 'csrf_token'

What could be the problem? I'm using Django 1.1. BTW.

---

Add django.middleware.csrf.CsrfViewMiddleware to MIDDLEWARE in settings.py.

MIDDLEWARE = [
  'django.middleware.csrf.CsrfViewMiddleware'
]