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

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java.lang.NullPointerException:
at org.nd4j.linalg.cpu.nativecpu.CpuNDArrayFactory.concat(CpuNDArrayFactory.java:578)
at org.nd4j.linalg.factory.Nd4j.concat(Nd4j.java:4795)
at org.nd4j.linalg.factory.BaseNDArrayFactory.hstack(BaseNDArrayFactory.java:1190)
at org.deeplearning4j.text.movingwindow.WindowConverter.asExampleMatrix(WindowConverter.java:100)
at org.deeplearning4j.models.word2vec.iterator.Word2VecDataSetIterator.fromCached(Word2VecDataSetIterator.java:186)
at org.deeplearning4j.models.word2vec.iterator.Word2VecDataSetIterator.next(Word2VecDataSetIterator.java:152)
at org.deeplearning4j.models.word2vec.iterator.Word2VecDataSetIterator.next(Word2VecDataSetIterator.java:275)
at org.deeplearning4j.models.word2vec.iterator.Word2VecDataSetIterator.next(Word2VecDataSetIterator.java:46)

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