fc6下不能添加打印机

tinadi

在终端里用root运行：system-config-printer 结果出现如下错误。这个该怎么纠正呢？
(system-config-printer.py:3341): libgnomevfs-WARNING **: Failed to open session DBUS connection: Unable to determine the address of the message bus (try 'man dbus-launch' and 'man dbus-daemon' for help)
Volume monitoring will not work.
Traceback (most recent call last):
  File "/usr/share/system-config-printer/system-config-printer.py", line 2459, in ?
    main()
  File "/usr/share/system-config-printer/system-config-printer.py", line 2450, in main
    mainwindow = GUI()
  File "/usr/share/system-config-printer/system-config-printer.py", line 310, in __init__
    self.populateList()
  File "/usr/share/system-config-printer/system-config-printer.py", line 389, in populateList
    self.printers = cupshelpers.getPrinters(self.cups)
  File "/usr/share/system-config-printer/cupshelpers.py", line 213, in getPrinters
    printers_conf = PrintersConf(connection)
  File "/usr/share/system-config-printer/cupshelpers.py", line 293, in __init__
    self.parse(self.fetch('/admin/conf/printers.conf'), 'Printer')
  File "/usr/share/system-config-printer/cupshelpers.py", line 321, in parse
    self.device_uris[current_printer] = words[1]
IndexError: list index out of range