DbControl not working in clustered environment

Hi all,
I have a situation here with Oracle dbcontrol -it is not working in clustered environment. It is working on one node but fails on other node. Any suggestions ?
Thanks in advance !

http://download.oracle.com/docs/cd/B28359_01/server.111/b28319/emca.htm
in this article Oracle has given example with RAC. so thats why i asked that question.Exactly, with RAC. If you specify -cluster option, you should have a running cluster, isn't it ?

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