Convore Exception

gistfile1.txt

Traceback (most recent call last):
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/eventlet/wsgi.py", line 336, in handle_one_response
    result = self.application(self.environ, start_response)
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/core/handlers/wsgi.py", line 245, in __call__
    response = middleware_method(request, response)
  File "/home/convore/convore/django_ext/middleware/log.py", line 30, in process_response
    'trk': getattr(request, 'trk', None),
  File "/home/convore/convore/django_ext/logging.py", line 27, in log_event
    if has_session and request.user.is_authenticated():
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/contrib/auth/middleware.py", line 9, in __get__
    request._cached_user = get_user(request)
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/contrib/auth/__init__.py", line 102, in get_user
    user = backend.get_user(user_id) or AnonymousUser()
  File "/home/convore/convore/django_ext/authentication_backends.py", line 9, in get_user
    return User.objects.select_related('profile').get(pk=user_id)
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/models/query.py", line 342, in get
    num = len(clone)
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/models/query.py", line 80, in __len__
    self._result_cache = list(self.iterator())
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/models/query.py", line 271, in iterator
    for row in compiler.results_iter():
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 677, in results_iter
    for rows in self.execute_sql(MULTI):
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 731, in execute_sql
    cursor = self.connection.cursor()
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/backends/__init__.py", line 75, in cursor
    cursor = self._cursor()
  File "/home/convore/virtualenvs/convore/lib/python2.6/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 136, in _cursor
    self.connection = Database.connect(**conn_params)
OperationalError: can't set datestyle to ISO