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

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at org.nd4j.linalg.cpu.nativecpu.CpuNDArrayFactory.concat(
at org.nd4j.linalg.factory.Nd4j.concat(
at org.nd4j.linalg.factory.BaseNDArrayFactory.hstack(
at org.deeplearning4j.text.movingwindow.WindowConverter.asExampleMatrix(
at org.deeplearning4j.models.word2vec.iterator.Word2VecDataSetIterator.fromCached(

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