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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.nd4j.linalg.factory.Nd4j.hstack(Nd4j.java:4658)	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)