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This exception has no message.
java.lang.NullPointerException at$Skin.getWidth(Unknown Source) at$Skin.getWidth(Unknown Source) at$CheckBoxIcon.getIconWidth(Unknown Source) at javax.swing.SwingUtilities.layoutCompoundLabelImpl(Unknown Source) at javax.swing.SwingUtilities.layoutCompoundLabel(Unknown Source) at javax.swing.plaf.basic.BasicRadioButtonUI.paint(Unknown Source) at javax.swing.plaf.ComponentUI.update(Unknown Source) at javax.swing.JComponent.paintComponent(Unknown Source)