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

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java.lang.NullPointerException:
at com.sun.java.swing.plaf.windows.WindowsButtonUI.getPreferredSize(WindowsButtonUI.java:123)
at javax.swing.plaf.basic.BasicButtonUI.getMinimumSize(BasicButtonUI.java:382)
at javax.swing.JComponent.getMinimumSize(JComponent.java:1356)
at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:894)
at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:806)
at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:1377)
at java.awt.GridBagLayout.arrangeGrid(GridBagLayout.java:1336)
at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:706)
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.validateTree(Container.java:1096)
at java.awt.Container.validate(Container.java:1064)
at java.awt.Window.pack(Window.java:433)
at tfcomp.ui.dialog.PropertiesDialog.initComponents(PropertiesDialog.java:3832)
at tfcomp.ui.dialog.PropertiesDialog.(PropertiesDialog.java:43)
at tfcomp.ui.dialog.TFCompanion.CustomDialog_Action(TFCompanion.java:2064)
at tfcomp.ui.dialog.TFCompanion$SymAction.actionPerformed(TFCompanion.java:1890)
at java.awt.MenuItem.processActionEvent(MenuItem.java:588)
at java.awt.MenuItem.processEvent(MenuItem.java:548)
at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:285)
at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:273)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:452)
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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