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java.lang.IllegalArgumentException: mean does not apply to multiple cols. at water.exec.ASTMean.apply(ASTOp.java:1266) at water.exec.ASTddply$RemoteExec.compute2(ASTRApply.java:472) at water.H2O$H2OCountedCompleter.compute(H2O.java:712) 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)