trouble installing the django-socialregistration app

Hello,
I'm new to django and hope I'm not asking an obvious question.

I've tried to install django-socialregistration. I have the api_key
and secret_key in settings.py, but I keep getting the following error:
File "C:\projects\sample\Pinax-0.7.3-bundle\env\lib\site-packages
\django\core\servers\basehttp.py", line 279, in run
self.result = application(self.environ, self.start_response)

File "C:\projects\sample\Pinax-0.7.3-bundle\env\lib\site-packages
\django\core\servers\basehttp.py", line 651, in __call__
return self.application(environ, start_response)

File "C:\projects\sample\Pinax-0.7.3-bundle\env\lib\site-packages
\django\core\handlers\wsgi.py", line 241, in __call__
response = self.get_response(request)

File "C:\projects\sample\Pinax-0.7.3-bundle\env\lib\site-packages
\django\core\handlers\base.py", line 72, in get_response
response = middleware_method(request)

File "C:\projects\sample\Pinax-0.7.3-bundle\mysite\socialregistration
\middleware.py", line 24, in process_request
settings.FACEBOOK_API_KEY, settings.FACEBOOK_SECRET_KEY)

File "C:\projects\sample\Pinax-0.7.3-bundle\mysite\facebook.py",
line 204, in get_user_from_cookie
cookie = cookies.get("fbs_" + app_id, "")

TypeError: cannot concatenate 'str' and 'tuple' objects

I'm not sure how to go about debugging this. Any pointers would be
great.

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