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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(DecisionTree.java:146)	at DecisionTree.(DecisionTree.java:42)	at FileChooser.createDecisionTree(FileChooser.java:328)	at FileChooser.actionPerformed(FileChooser.java:77)	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)