#8 NullPointerException during training of loaded network

[Jan Schäfer]

When I load a saved MultiLayerPerceptron network and want to try to train it again, I get a NullPointerException:

Exception in thread "Thread-3559" java.lang.NullPointerException
at org.neuroph.nnet.learning.MomentumBackpropagation.updateNeuronWeights(MomentumBackpropagation.java:77)
at org.neuroph.nnet.learning.SigmoidDeltaRule.adjustOutputNeurons(SigmoidDeltaRule.java:79)
at org.neuroph.nnet.learning.BackPropagation.updateNetworkWeights(BackPropagation.java:57)
at org.neuroph.core.learning.SupervisedLearning.learnPattern(SupervisedLearning.java:204)
at org.neuroph.core.learning.SupervisedLearning.doLearningEpoch(SupervisedLearning.java:145)
at org.neuroph.nnet.learning.LMS.doLearningEpoch(LMS.java:147)

It looks like the training data of the weigths are lost.