Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/api.py", line 378, in send_error
    'text/html')
  File "/usr/lib/python2.4/site-packages/trac/web/chrome.py", line 688, in render_template
    data = self.populate_data(req, data)
  File "/usr/lib/python2.4/site-packages/trac/web/chrome.py", line 596, in populate_data
    d['chrome'].update(req.chrome)
  File "/usr/lib/python2.4/site-packages/trac/web/api.py", line 205, in __getattr__
    value = self.callbacks[name](self)
  File "/usr/lib/python2.4/site-packages/trac/web/chrome.py", line 464, in prepare_request
    for category, name, text in contributor.get_navigation_items(req):
  File "/usr/lib/python2.4/site-packages/trac/ticket/query.py", line 737, in get_navigation_items
    if 'TICKET_VIEW' in req.perm and \
  File "/usr/lib/python2.4/site-packages/trac/perm.py", line 571, in has_permission
    return self._has_permission(action, resource)
  File "/usr/lib/python2.4/site-packages/trac/perm.py", line 584, in _has_permission
    decision = PermissionSystem(self.env). \
  File "/usr/lib/python2.4/site-packages/trac/perm.py", line 472, in check_permission
    perm)
  File "/usr/lib/python2.4/site-packages/trac/perm.py", line 304, in check_permission
    permissions = PermissionSystem(self.env). \
  File "/usr/lib/python2.4/site-packages/trac/perm.py", line 390, in get_user_permissions
    for perm in self.store.get_user_permissions(username):
  File "/usr/lib/python2.4/site-packages/trac/perm.py", line 194, in get_user_permissions
    db = self.env.get_db_cnx()
  File "/usr/lib/python2.4/site-packages/trac/env.py", line 264, in get_db_cnx
    return DatabaseManager(self).get_connection()
  File "/usr/lib/python2.4/site-packages/trac/db/api.py", line 75, in get_connection
    connector, args = self._get_connector()
  File "/usr/lib/python2.4/site-packages/trac/db/api.py", line 87, in _get_connector
    scheme, args = _parse_db_str(sfjson)
  File "/usr/lib/python2.4/site-packages/trac/db/api.py", line 113, in _parse_db_str
    fp = open(sfjson, 'r')
IOError: [Errno 13] Permission denied: '/nfs/trac/conf/project/b/bi/bigdata/sf.json'