java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at water.Weaver.javassistLoadClass(Weaver.java:120)
at water.Weaver.javassistLoadClass(Weaver.java:121)
at water.Weaver.javassistLoadClass(Weaver.java:121)
at water.Weaver.javassistLoadClass(Weaver.java:121)
at water.Weaver.javassistLoadClass(Weaver.java:121)
at water.Weaver.genDelegate(Weaver.java:60)
at water.TypeMap.getIcer(TypeMap.java:166)
at water.TypeMap.theFreezable(TypeMap.java:189)
at water.TypeMap.newFreezable(TypeMap.java:181)
at water.AutoBuffer.get(AutoBuffer.java:720)
at water.parser.ParseSetup$GuessSetupTsk$Icer.read54(ParseSetup$GuessSetupTsk$Icer.java)
at water.parser.ParseSetup$GuessSetupTsk$Icer.read(ParseSetup$GuessSetupTsk$Icer.java)
at water.H2O$H2OCountedCompleter.read(H2O.java:623)
at water.RPC.response(RPC.java:553)
at water.RPC.tcp_ack(RPC.java:519)
at water.TCPReceiverThread$TCPReaderThread.run(TCPReceiverThread.java:86)

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