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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)