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

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java.lang.AssertionError:
at hex.ModelBuilder.init(ModelBuilder.java:937)
at hex.deeplearning.DeepLearning.init(DeepLearning.java:69)
at hex.deeplearning.DeepLearning$DeepLearningDriver.computeImpl(DeepLearning.java:203)
at hex.ModelBuilder$Driver.compute2(ModelBuilder.java:168)
at hex.deeplearning.DeepLearning$DeepLearningDriver.compute2(DeepLearning.java:201)
at water.H2O$H2OCountedCompleter.compute(H2O.java:1198)
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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