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java.lang.ExceptionInInitializerError at org.deeplearning4j.nn.conf.NeuralNetConfiguration$Builder.seed(NeuralNetConfiguration.java:624) at org.deeplearning4j.examples.feedforward.anomalydetection.MNISTAnomalyExample.main(MNISTAnomalyExample.java:46)Caused by: java.lang.RuntimeException: org.nd4j.linalg.factory.Nd4jBackend$NoAvailableBackendException: Please ensure that you have an nd4j backend on your classpath. Please see: http://nd4j.org/getstarted.html at org.nd4j.linalg.factory.Nd4j.initContext(Nd4j.java:5556) at org.nd4j.linalg.factory.Nd4j.<clinit>(Nd4j.java:189) ... 2 moreCaused by: org.nd4j.linalg.factory.Nd4jBackend$NoAvailableBackendException: Please ensure that you have an nd4j backend on your classpath. Please see: http://nd4j.org/getstarted.html at org.nd4j.linalg.factory.Nd4jBackend.load(Nd4jBackend.java:259) at org.nd4j.linalg.factory.Nd4j.initContext(Nd4j.java:5553) ... 3 more