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java.lang.NullPointerExceptionjava.lang.NullPointerException: 	at water.fvec.NewChunk.bufB(NewChunk.java:1455)	at water.fvec.NewChunk.compress2(NewChunk.java:1209)	at water.fvec.NewChunk.compress(NewChunk.java:1013)	at water.fvec.NewChunk.new_close(NewChunk.java:876)	at water.fvec.Chunk.close(Chunk.java:561)	at water.MRTask.compute2(MRTask.java:650)	at water.H2O$H2OCountedCompleter.compute1(H2O.java:1201)	at hex.tree.ScoreBuildHistogram$Icer.compute1(ScoreBuildHistogram$Icer.java)	at water.H2O$H2OCountedCompleter.compute(H2O.java:1197)	at jsr166y.CountedCompleter.exec(CountedCompleter.java:468)	at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)	at jsr166y.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:914)	at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:979)	at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)	at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)