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java.lang.AssertionError at hex.tree.DRealHistogram.scoreMSE(DRealHistogram.java:118) at hex.tree.gbm.GBM$GBMDecidedNode.bestCol(GBM.java:660) at hex.tree.DTree$DecidedNode.<init>(DTree.java:357) at hex.tree.gbm.GBM$GBMDecidedNode.<init>(GBM.java:648) at hex.tree.gbm.GBM.makeDecided(GBM.java:640) at hex.tree.SharedTree$ScoreBuildOneTree.onCompletion(SharedTree.java:334) at jsr166y.CountedCompleter.tryComplete(CountedCompleter.java:386) at water.MRTask.compute2(MRTask.java:667) at water.H2O$H2OCountedCompleter.compute(H2O.java:867) at jsr166y.CountedCompleter.exec(CountedCompleter.java:429) at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263) at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974) at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)