使用kde的问题？

plow7912

刚刚开始用kde， 原来用的gnome， acpi中的powerbtn.sh 正常

安了kde， 在kde下 powerbtn.sh中

dcop --all-sessions --all-users ksmserver ksmserver logout 0 2 0

出错。
错误信息：
DCOPClient::attachInternal. Attach failed Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
DCOPClient::attachInternal. Attach failed Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
ERROR: Couldn't attach to DCOP server!

应该如何解决？谢谢