optional module - upload avatar configuration problem

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I am following the steps described in askbot documentation regarding upload avatars.

1. I run the command pip install -e git+git://github.com/ericflo/django-avatar.git#egg=django-avatar

2. I add inside my settings.py, in INSTALLED_APPS, this line: 'avatar',

3. I run python manage.py syncdb

4. MEDIA_ROOT and MEDIA_URL are already configured inside my settings.py

Additional info:

a) The first time I tried to run manage.py syncdb I got exceptions that my environment is not configured with PIL. So I run pip install PIL and the specific problem disappeared

b)There is a very similar question in askbot where @Evgeny asks (last comment) if a virtual env is used. In my case, I am using virtual environment, but I run all the above commands pointing to the right path of my virtual environment, so I am sure that I install everything in the right location.

c) I also run setup.py install, manage.py migrate, manage.py collectstatic (just in case is needed)

And now the problem (finally).

When I try to start the server, in logs of the server I am getting this exception: ImproperlyConfigured: Error importing middleware askbot.middleware.anon_user: "No module named avatar"

Any ideas? I also found these instructions in python site. Step 2 is similar but not the same with askbot urls.py. Is this important?