Recibo una excepción por debajo de RMI cuando intento ejecutar un servidor que utiliza un registro remoto.

Mi código de registro para el método principal en la clase Server2 es

Registry registry = LocateRegistry.getRegistry("192.168.1.4",1100);
registry.rebind("Hello",stub);

192.168.1.4 es otra máquina en la misma LAN.

Por favor, ayúdame.

Server2 exception:java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: 
 java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
 java.lang.ClassNotFoundException: example.Hello.RemoteHello2
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: 
 java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
 java.lang.ClassNotFoundException: example.Hello.RemoteHello2
 at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:396)
 at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
 at sun.rmi.transport.Transport$1.run(Transport.java:159)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
 at java.lang.Thread.run(Thread.java:619)
 at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:273)
 at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:251)
 at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:377)
 at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
 at example.Hello.Server2.main(Server2.java:29)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
 java.lang.ClassNotFoundException: example.Hello.RemoteHello2
 at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
 at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:386)
 at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
 at sun.rmi.transport.Transport$1.run(Transport.java:159)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
 at java.lang.Thread.run(Thread.java:619)

Tengo la clase llamada RemoteHello2 y puedo confirmar esto porque otro programa de Servidor en el mismo paquete está funcionando bien.

Tengo 2 programas de servidor, 1 usa localhost como registro y el segundo usa un servidor remoto como registro.