java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at hex.grid.GridSearch.gridSearch(GridSearch.java:213)
at hex.grid.GridSearch.access$000(GridSearch.java:68)
at hex.grid.GridSearch$1.compute2(GridSearch.java:136)
at water.H2O$H2OCountedCompleter.compute(H2O.java:1090)
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)

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