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java.lang.ArrayIndexOutOfBoundsException: -1	at hex.gbm.GBM.doVarImpCalc(	at hex.gbm.GBM.doVarImpCalc(	at hex.gbm.SharedTreeModelBuilder.doScoring(	at hex.gbm.GBM.buildModel(	at hex.gbm.GBM.buildModel(	at hex.gbm.SharedTreeModelBuilder.buildModel(	at hex.gbm.GBM.execImpl(	at water.Job.exec(	at water.Job.access$000(	at water.Job$3.compute2(	at water.H2O$H2OCountedCompleter.compute(	at jsr166y.CountedCompleter.exec(	at jsr166y.ForkJoinTask.doExec(	at jsr166y.ForkJoinPool$WorkQueue.runTask(	at jsr166y.ForkJoinPool.runWorker(	at