Man, is problem solving really that hard? It's been forever since I've programed in Java so I Googled your error code. Second result that came up yielded this, "Thrown to indicate that the IP address of a host could not be determined." Have you started the RPCdaemon? Are you connected to a network with an IP address? Further, this is the Backtrack forum, not the Armitage forum. Go here for more help with it.