Django 1.4b1 (dev): Can't enable Admin site when following the official tutorial

Hi,

I'm installed the last version of Django (1.4b1) and I'm following the
tutorial (https://docs.djangoproject.com/en/dev/intro/tutorial01/)

I'm tryied to enable the Admin site (following exactly the steps
described on the tutorial), but when I try to acces to localhost:8000
or localhost:8000/admin I get the following error:

ImportError at /admin
cannot import name ListFilter
...
Exception Location: /Users/fjavieralba/virtualenvs/personal_page/lib/
python2.7/site-packages/django/contrib/admin/validation.py in
<module>, line 6
...

I'm using Mac OS X Lion and VirtualEnv. My python version is 2.7.1

Thanks!

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