java.lang.NullPointerException

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  • more help for a newbie please!
    via by 807596,
    • java.lang.NullPointerException at View$3.valueChanged(View.java:102) at javax.swing.JList.fireSelectionValueChanged(JList.java:1321) at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1335) at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187) at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167) at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214) at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:402) at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:411) at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:435) at javax.swing.JList.setSelectionInterval(JList.java:1608) at javax.swing.plaf.basic.BasicListUI$MouseInputHandler.adjustFocusAndSelection(BasicListUI.java:1333) at javax.swing.plaf.basic.BasicListUI$MouseInputHandler.mousePressed(BasicListUI.java:1295) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:222) at java.awt.Component.processMouseEvent(Component.java:5097) at java.awt.Component.processEvent(Component.java:4897) at java.awt.Container.processEvent(Container.java:1569) at java.awt.Component.dispatchEventImpl(Component.java:3615) at java.awt.Container.dispatchEventImpl(Container.java:1627) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3195) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128) at java.awt.Container.dispatchEventImpl(Container.java:1613) at java.awt.Window.dispatchEventImpl(Window.java:1606) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.EventQueue.dispatchEvent(EventQueue.java:456) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137) at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
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