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java.lang.NullPointerException: 	at java.util.Hashtable.put(	at sun.rmi.registry.RegistryImpl.rebind(	at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)	at sun.rmi.server.UnicastServerRef.oldDispatch(	at sun.rmi.server.UnicastServerRef.dispatch(	at sun.rmi.transport.Transport$	at Method)	at sun.rmi.transport.Transport.serviceCall(	at sun.rmi.transport.tcp.TCPTransport.handleMessages(	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(	at sun.rmi.transport.tcp.TCPTransport$	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(	at java.util.concurrent.ThreadPoolExecutor$	at	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(	at sun.rmi.transport.StreamRemoteCall.executeCall(	at sun.rmi.server.UnicastRef.invoke(	at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)	at java.rmi.Naming.rebind(	at com.pack.rmi.RemoteServer.(	at com.pack.rmi.RemoteServer.main(