org.omg.CORBA.INTERNAL

Hi,
I am a novice to CORBA, I am trying to run the dds demo of JACORB, I
managed to run the demo on a standalone machine but when I try to run
it in a distributed environment, I get the following exception:

org.omg.CORBA.INTERNAL: server-side Exception: null vmcid: SUN minor
code: 202 completed: No

can anyone please suggest me how can I resolve this problem

Thanks

Tariq Zafar