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java.lang.AssertionError at water.fvec.Frame.<init>(Frame.java:39) at water.MRTask2.doAll(MRTask2.java:170) at water.MRTask2.doAll(MRTask2.java:169) at water.api.ConfusionMatrix.serve(ConfusionMatrix.java:59) at water.api.Request.serveGrid(Request.java:115) at water.Request2.superServeGrid(Request2.java:420) at water.Request2.serveGrid(Request2.java:348) at water.api.Request.serve(Request.java:98) at water.api.RequestServer.serve(RequestServer.java:240) at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:391) at java.lang.Thread.run(Thread.java:662)