Problem creating an MBean on BEA weblogic 6.1

Problem creating an MBean on BEA weblogic 6.1

When i try to creat an MBean action app manager for a server running BEA 6.1 it tells me to check that the server is running. I have done this before with this version of Appmanager and BEA weblogic. I know that the server is running and the Appmanger is displaying other BEA and solaris date on this particular server.

Can you please help

Kind regards
Grant Swift