java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javax.swing.plaf.metal.MetalLookAndFeel.getControlInfo(MetalLookAndFeel.java:1072)
at javax.swing.plaf.metal.MetalComboBoxIcon.paintIcon(MetalComboBoxIcon.java:35)
at javax.swing.plaf.metal.MetalComboBoxButton.paintComponent(MetalComboBoxButton.java:122)
at javax.swing.JComponent.paint(JComponent.java:682)
at javax.swing.JComponent.paintChildren(JComponent.java:493)
at javax.swing.JComponent.paint(JComponent.java:691)
at javax.swing.JComponent.paintWithBuffer(JComponent.java:3873)
at javax.swing.JComponent._paintImmediately(JComponent.java:3816)
at javax.swing.JComponent.paintImmediately(JComponent.java:3667)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:365)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:119)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:149)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:332)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:126)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:88)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:80)

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