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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicListUI.updateLayoutState(Unknown Source)	at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(Unknown Source)	at javax.swing.plaf.basic.BasicListUI.getCellBounds(Unknown Source)	at javax.swing.JList.getCellBounds(Unknown Source)	at javax.swing.JList.ensureIndexIsVisible(Unknown Source)	at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.ensureIndexIsVisible(Unknown Source)	at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.ensureFileIsVisible(Unknown Source)	at javax.swing.JFileChooser.ensureFileIsVisible(Unknown Source)	at javax.swing.JFileChooser.setSelectedFile(Unknown Source)	at com.sun.java.swing.plaf.windows.WindowsFileChooserUI$14.valueChanged(Unknown Source)	at javax.swing.JList.fireSelectionValueChanged(Unknown Source)	at javax.swing.JList$ListSelectionHandler.valueChanged(Unknown Source)	at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)	at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)	at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)	at javax.swing.DefaultListSelectionModel.changeSelection(Unknown Source)	at javax.swing.DefaultListSelectionModel.changeSelection(Unknown Source)	at javax.swing.DefaultListSelectionModel.setSelectionInterval(Unknown Source)	at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.setFileSelected(Unknown Source)	at com.sun.java.swing.plaf.windows.WindowsFileChooserUI$DelayedSelectionUpdater.run(Unknown Source)	at java.awt.event.InvocationEvent.dispatch(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)