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This exception has no message.
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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicComboBoxUI.paintCurrentValue(BasicComboBoxUI.java:1232)	at javax.swing.plaf.metal.MetalComboBoxUI.paintCurrentValue(MetalComboBoxUI.java:90)	at javax.swing.plaf.basic.BasicComboBoxUI.paint(BasicComboBoxUI.java:917)	at javax.swing.plaf.metal.MetalComboBoxUI.paint(MetalComboBoxUI.java:62)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)	at javax.swing.JComponent.paintComponent(JComponent.java:780)	at javax.swing.JComponent.paint(JComponent.java:1056)	at javax.swing.JComponent.paintChildren(JComponent.java:889)