trac安裝 error log

Creating and Initializing Project
Initenv for '/home/trac/nvda-taiwan' failed.
 Failed to create environment.
need more than 1 value to unpack
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/trac/admin/console.py", line 568, in do_initenv options=options)
  File "/usr/lib/python2.5/site-packages/trac/env.py", line 188, in __init__ self.create(options)
  File "/usr/lib/python2.5/site-packages/trac/env.py", line 311, in create DatabaseManager(self).init_db()
  File "/usr/lib/python2.5/site-packages/trac/db/api.py", line 69, in init_db connector, args = self._get_connector()
  File "/usr/lib/python2.5/site-packages/trac/db/api.py", line 85, in _get_connector scheme, args = parse_db_str(self.connection_uri)
  File "/usr/lib/python2.5/site-packages/trac/db/api.py", line 111, in _parse_db_str scheme, rest = db_str.split(':', 1)
ValueError: need more than 1 value to unpack