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java.lang.NullPointerException: 	at com.healthmarketscience.rmiio.RemoteInputStreamServer.readPacket(RemoteInputStreamServer.java:146)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:303)	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:662)	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)