title: Neuroph: Error at Neural network learning
body: <p>I´m trying to run an Artificial Neural Network with Neuroph Studio, using the given example of a Multi Layer Perceptron Network. Every time I try, I get the same error in the log console:</p>
  
  <pre><code>SEVERE [global]
  java.lang.NullPointerException
      at org.neuroph.core.learning.SupervisedLearning.beforeEpoch(SupervisedLearning.java:127)
      at org.neuroph.core.learning.IterativeLearning.learn(IterativeLearning.java:163)
  [catch] at org.neuroph.core.NeuralNetwork$1.run(NeuralNetwork.java:289)
  </code></pre>
  
  <p>My system is:</p>
  
  <pre><code>Product Version: NeurophStudio 201210100934
  Java: 1.7.0_07; Java HotSpot(TM) 64-Bit Server VM 23.3-b01
  System: Windows 7 version 6.1 running on amd64; Cp1252; es_ES (neurophstudio)
  User directory: C:\Users\i3casa\AppData\Roaming\.neurophstudio\dev
  Cache directory: C:\Users\i3casa\AppData\Roaming\.neurophstudio\dev\var\cache
  </code></pre>
  
  <p>Do you know any ammendment to this error?</p>
  
  <p>Thanks.</p>