I dont know but ejb expecification says that all remote interface methods must throw (and declara with "throws java.rmi.RemoteException" the signature of all remote interface methods)
The error indicates that one of the methods of the remote interface for the bean Fibo doesn`t do that)
It might seems like an error in the declaration of fibo bean remote interface.
Or at least it is what i think, but it is strange that this error could happend.
If you have the source of the sample revise the remote interface for Fibo and check that al the methods declarations have a "throws java.rmi.RemoteException2.