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

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java.lang.NullPointerException:
at java.util.Arrays.copyOf(Arrays.java:2320)
at hex.glm.GLM$GLMSingleLambdaTsk.activeCols(GLM.java:895)
at hex.glm.GLM$GLMSingleLambdaTsk.compute2(GLM.java:1461)
at water.H2O$H2OCountedCompleter.compute(H2O.java:1005)
at jsr166y.CountedCompleter.exec(CountedCompleter.java:429)
at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)
at jsr166y.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:914)
at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:979)
at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)
at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)

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