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java.lang.ArrayIndexOutOfBoundsException: -2 at hex.tree.DTree.node(DTree.java:83) at hex.tree.gbm.GBM$GBMDriver.fitBestConstantsQuantile(GBM.java:533) at hex.tree.gbm.GBM$GBMDriver.buildNextKTrees(GBM.java:420) at hex.tree.SharedTree$Driver.scoreAndBuildTrees(SharedTree.java:279) at hex.tree.SharedTree$Driver.compute2(SharedTree.java:225) at water.H2O$H2OCountedCompleter.compute(H2O.java:1181) at jsr166y.CountedCompleter.exec(CountedCompleter.java:468) at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263) at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974) at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477) at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)