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This exception has no message.
java.lang.NullPointerException: 	at javax.swing.GrayFilter.createDisabledImage(GrayFilter.java:32)	at javax.swing.AbstractButton.getDisabledIcon(AbstractButton.java:574)	at javax.swing.plaf.basic.BasicButtonUI.paintIcon(BasicButtonUI.java:280)	at javax.swing.plaf.basic.BasicButtonUI.paint(BasicButtonUI.java:248)	at com.sun.java.swing.plaf.windows.WindowsButtonUI.paint(WindowsButtonUI.java:152)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)	at javax.swing.JComponent.paintComponent(JComponent.java:541)	at javax.swing.JComponent.paint(JComponent.java:808)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1021)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4795)	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)	at javax.swing.JComponent._paintImmediately(JComponent.java:4692)	at javax.swing.JComponent.paintImmediately(JComponent.java:4495)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)	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)