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

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java.lang.NullPointerException:
at com.bd.bknet.datamodel.DefaultItem.hashCode(DefaultItem.java:361)
at java.util.HashMap.hash(HashMap.java:261)
at java.util.HashMap.put(HashMap.java:379)
at java.util.HashSet.add(HashSet.java:192)
at kodo.util.ProxyHashSet.add(ProxyHashSet.java:87)
at kodo.runtime.AbstractPCData.toField(AbstractPCData.java:70)
at kodo.remote.RemotePCDataImpl.load(RemotePCDataImpl.java:94)
at kodo.remote.FlushCommand.update(FlushCommand.java:202)
at kodo.remote.FlushCommand.execute(FlushCommand.java:132)
at kodo.remote.PersistenceManagerCommand.execute(PersistenceManagerCommand.java:28)
at kodo.remote.JDOCommand.execute(JDOCommand.java:46)
at com.solarmetric.remote.CommandIO.execute(CommandIO.java:160)
at com.solarmetric.remote.ClientHandlerRunnable.run(ClientHandlerRunnable.java:70)
at java.lang.Thread.run(Thread.java:534)

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