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

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java.lang.NullPointerException:
at water.fvec.NewChunk.add(NewChunk.java:102)
at water.exec.ASTddply$ddplyPass1.reduce(ASTRApply.java:331)
at water.exec.ASTddply$ddplyPass1.reduce(ASTRApply.java:269)
at water.MRTask2.reduce4(MRTask2.java:466)
at water.MRTask2.reduce3(MRTask2.java:454)
at water.MRTask2.postLocal(MRTask2.java:424)
at water.MRTask2.onCompletion(MRTask2.java:402)
at jsr166y.CountedCompleter.tryComplete(CountedCompleter.java:386)
at water.RPC$1.compute2(RPC.java:507)
at water.H2O$H2OCountedCompleter.compute(H2O.java:710)
at jsr166y.CountedCompleter.exec(CountedCompleter.java:429)
at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)
at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974)
at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)
at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)

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