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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTableUI$3.actionPerformed(BasicTableUI.java:675)	at javax.swing.JComponent.processKeyBinding(JComponent.java:1684)	at javax.swing.JComponent.processKeyBindings(JComponent.java:1697)	at javax.swing.JComponent.processKeyEvent(JComponent.java:1609)	at java.awt.Component.processEvent(Component.java:3013)	at java.awt.Container.processEvent(Container.java:1014)	at java.awt.Component.dispatchEventImpl(Component.java:2399)	at java.awt.Container.dispatchEventImpl(Container.java:1059)	at java.awt.Component.dispatchEvent(Component.java:2312)	at java.awt.LightweightDispatcher.processKeyEvent(Container.java:1791)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1765)	at java.awt.Container.dispatchEventImpl(Container.java:1046)	at java.awt.Window.dispatchEventImpl(Window.java:749)	at java.awt.Component.dispatchEvent(Component.java:2312)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:301)