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    • java.lang.NullPointerException at java.lang.String.compareTo(Unknown Source) at java.lang.String.compareTo(Unknown Source) at java.util.Arrays.mergeSort(Unknown Source) at java.util.Arrays.sort(Unknown Source) at DecisionTree.calculateSplit( at DecisionTree.<init>( at FileChooser.createDecisionTree( at FileChooser.actionPerformed( at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

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