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java.lang.ArrayIndexOutOfBoundsException: -1	at hex.gbm.GBM.doVarImpCalc(GBM.java:510)	at hex.gbm.GBM.doVarImpCalc(GBM.java:24)	at hex.gbm.SharedTreeModelBuilder.doScoring(SharedTreeModelBuilder.java:233)	at hex.gbm.GBM.buildModel(GBM.java:158)	at hex.gbm.GBM.buildModel(GBM.java:24)	at hex.gbm.SharedTreeModelBuilder.buildModel(SharedTreeModelBuilder.java:177)	at hex.gbm.GBM.execImpl(GBM.java:122)	at water.Job.exec(Job.java:366)	at water.Job.access$000(Job.java:27)	at water.Job$3.compute2(Job.java:321)	at water.H2O$H2OCountedCompleter.compute(H2O.java:713)	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)