Mod_python error: "PythonHandler django.core.handlers.modpython"

Traceback (most recent call last):

  File "/usr/lib/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 222, in handler
    return ModPythonHandler()(req)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 195, in __call__
    response = self.get_response(request)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/base.py", line 67, in get_response
    response = middleware_method(request)

  File "/home/nooknetwork/apps/tracking/middleware.py", line 125, in process_request
    ips = [b.ip_address for b in BannedIP.objects.all()]

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 179, in _result_iter
    self._fill_cache()

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 612, in _fill_cache
    self._result_cache.append(self._iter.next())

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 269, in iterator
    for row in self.query.results_iter():

  File "/usr/lib/python2.4/site-packages/django/db/models/sql/query.py", line 206, in results_iter
    for rows in self.execute_sql(MULTI):

  File "/usr/lib/python2.4/site-packages/django/db/models/sql/query.py", line 1713, in execute_sql
    sql, params = self.as_sql()

  File "/usr/lib/python2.4/site-packages/django/db/models/sql/query.py", line 261, in as_sql
    ordering = self.get_ordering()

  File "/usr/lib/python2.4/site-packages/django/db/models/sql/query.py", line 648, in get_ordering
    self.model._meta, default_order=asc):

  File "/usr/lib/python2.4/site-packages/django/db/models/sql/query.py", line 674, in find_ordering_name
    opts, alias, False)

  File "/usr/lib/python2.4/site-packages/django/db/models/sql/query.py", line 1298, in setup_joins
    field, model, direct, m2m = opts.get_field_by_name(name)

  File "/usr/lib/python2.4/site-packages/django/db/models/options.py", line 281, in get_field_by_name
    cache = self.init_name_map()

  File "/usr/lib/python2.4/site-packages/django/db/models/options.py", line 311, in init_name_map
    for f, model in self.get_all_related_m2m_objects_with_model():

  File "/usr/lib/python2.4/site-packages/django/db/models/options.py", line 388, in get_all_related_m2m_objects_with_model
    cache = self._fill_related_many_to_many_cache()

  File "/usr/lib/python2.4/site-packages/django/db/models/options.py", line 402, in _fill_related_many_to_many_cache
    for klass in get_models():

  File "/usr/lib/python2.4/site-packages/django/db/models/loading.py", line 136, in get_models
    self._populate()

  File "/usr/lib/python2.4/site-packages/django/db/models/loading.py", line 57, in _populate
    self.load_app(app_name, True)

  File "/usr/lib/python2.4/site-packages/django/db/models/loading.py", line 72, in load_app
    mod = __import__(app_name, {}, {}, ['models'])

  File "/home/nooknetwork/nooks/clubnook/site_specific/models.py", line 14, in ?
    class ClubNookProfile(models.Model):

  File "/home/nooknetwork/nooks/clubnook/site_specific/models.py", line 22, in ClubNookProfile
    top_friends = models.ManyToManyField("self", related_name="top_friends",blank=True,filter_interface=models.HORIZONTAL,editable=False)

AttributeError: 'module' object has no attribute 'HORIZONTAL'