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 163, in handler
    return ModPythonHandler()(req)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 140, in __call__
    response = middleware_method(request, response)

  File "/usr/lib/python2.4/site-packages/django/contrib/sessions/middleware.py", line 81, in process_response
    session_key = request.session.session_key or Session.objects.get_new_session_key()

  File "/usr/lib/python2.4/site-packages/django/contrib/sessions/models.py", line 21, in get_new_session_key
    self.get(session_key=session_key)

  File "/usr/lib/python2.4/site-packages/django/db/models/manager.py", line 67, in get
    return self.get_query_set().get(*args, **kwargs)

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 211, in get
    obj_list = list(clone)

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 103, in __iter__
    return iter(self._get_data())

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 430, in _get_data
    self._result_cache = list(self.iterator())

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 170, in iterator
    cursor = connection.cursor()

  File "/usr/lib/python2.4/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 43, in cursor
    self.connection = Database.connect(conn_string)

OperationalError: could not connect to server: No such file or directory
	Is the server running locally and accepting
	connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?