django - nginx+fastcgi --> Unhandled Exception (after upgrade from Django 1.2.4 to Django 1.3)

I just upgraded from django 1.2.4 to 1.3.

I'm using nginx in conjunction with fastcgi and for some reason every time when I access a page开发者_开发百科 I get this error:

Unhandled Exception

An unhandled exception was thrown by the application.

Any ideas what the problem might be?

You need to track down your fastcgi error log. There should me more detailed information in there.

To fix it I added this class (that practically doesn't do anything) in the : /usr/local/lib/python2.6/dist-packages/django/middleware/http.py

class SetRemoteAddrFromForwardedFor(object):
    """
    This middleware has been removed; see the Django 1.1 release notes for
    details.

    It previously set REMOTE_ADDR based on HTTP_X_FORWARDED_FOR. However, after
    investiagtion, it turns out this is impossible to do in a general manner:
    different proxies treat the X-Forwarded-For header differently. Thus, a
    built-in middleware can lead to application-level security problems, and so
    this was removed in Django 1.1

    """
    def __init__(self):
        import warnings
        warnings.warn("SetRemoteAddrFromForwardedFor has been removed. "
                      "See the Django 1.1 release notes for details.",
                      category=DeprecationWarning)
        raise MiddlewareNotUsed()