Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/web/api.py", line 339, in send_error
    'text/html')
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/web/chrome.py", line 673, in render_template
    data = self.populate_data(req, data)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/web/chrome.py", line 581, in populate_data
    d['chrome'].update(req.chrome)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/web/api.py", line 168, in __getattr__
    value = self.callbacks[name](self)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/web/chrome.py", line 452, in prepare_request
    for category, name, text in contributor.get_navigation_items(req):
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/ticket/web_ui.py", line 133, in get_navigation_items
    if 'TICKET_CREATE' in req.perm:
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/perm.py", line 521, in has_permission
    return self._has_permission(action, resource)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/perm.py", line 535, in _has_permission
    check_permission(action, perm.username, resource, perm)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/perm.py", line 424, in check_permission
    perm)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/perm.py", line 282, in check_permission
    get_user_permissions(username)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/perm.py", line 357, in get_user_permissions
    for perm in self.store.get_user_permissions(username):
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/perm.py", line 173, in get_user_permissions
    db = self.env.get_db_cnx()
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/env.py", line 250, in get_db_cnx
    return DatabaseManager(self).get_connection()
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/db/api.py", line 76, in get_connection
    return self._cnx_pool.get_cnx(self.timeout or None)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/db/pool.py", line 101, in get_cnx
    cnx = self._connector.get_connection(**self._kwargs)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/db/postgres_backend.py", line 46, in get_connection
    cnx = PostgreSQLConnection(path, user, password, host, port, params)
  File "/usr/lib/python2.5/site-packages/Trac-0.11b2-py2.5.egg/trac/db/postgres_backend.py", line 133, in __init__
    cnx = psycopg.connect(' '.join(dsn))
OperationalError: could not translate host name "localhost" to address: Name or service not known