There are a couple of things that this could be. Perhaps, a typo in the topic name or connection factory name. More likely, the topic is targeted to a server other than the "AdminServer" -- default port 7001. If the topic is targeted to one of the "ManagedServers", soa_server1 or bam_server1, then you need to use that port number (e.g. 8001 or 9001). If it's not one of those 2 things, maybe there's a problem resolving the server name on the network.
If that doesn't help, it might have something to do with the set-up of your topic in WebLogic Server.