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

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java.lang.NullPointerException:
at water.fvec.TransfVec.masterVec(TransfVec.java:27)
at water.fvec.TransfVec.elem2BV(TransfVec.java:32)
at water.fvec.Vec.chunk(Vec.java:433)
at water.fvec.Vec.isNA(Vec.java:451)
at hex.Layer$VecSoftmax.target(Layer.java:456)
at hex.NeuralNet.eval(NeuralNet.java:247)
at hex.NeuralNet.eval(NeuralNet.java:235)
at hex.NeuralNet.eval(NeuralNet.java:223)
at hex.NeuralNet$2.eval(NeuralNet.java:198)
at hex.NeuralNet$2.eval(NeuralNet.java:187)
at hex.NeuralNet$2.run(NeuralNet.java:163)

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