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

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This exception has no message.
java.lang.NullPointerException:
at com.sun.java.swing.plaf.windows.WindowsRadioButtonUI.getPreferredSize(WindowsRadioButtonUI.java:94)
at javax.swing.plaf.basic.BasicButtonUI.getMinimumSize(BasicButtonUI.java:382)
at javax.swing.JComponent.getMinimumSize(JComponent.java:1356)
at javax.swing.BoxLayout.checkRequests(BoxLayout.java:426)
at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:244)
at java.awt.Container.preferredSize(Container.java:1175)
at java.awt.Container.getPreferredSize(Container.java:1159)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1274)
at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:892)
at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:806)
at java.awt.GridBagLayout.preferredLayoutSize(GridBagLayout.java:630)
at java.awt.Container.preferredSize(Container.java:1175)
at java.awt.Container.getPreferredSize(Container.java:1159)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1274)
at java.awt.BorderLayout.layoutContainer(BorderLayout.java:660)
at java.awt.Container.layout(Container.java:1017)
at java.awt.Container.doLayout(Container.java:1007)
at java.awt.Container.validateTree(Container.java:1089)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validate(Container.java:1064)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:353)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:116)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

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