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java.lang.NullPointerException at javax.swing.BoxLayout.preferredLayoutSize(Unknown Source) at javax.swing.plaf.basic.DefaultMenuLayout.preferredLayoutSize(UnknownSource) at java.awt.Container.preferredSize(Unknown Source) at java.awt.Container.getPreferredSize(Unknown Source) at javax.swing.JComponent.getPreferredSize(Unknown Source) at javax.swing.JRootPane$RootLayout.layoutContainer(Unknown Source) at java.awt.Container.layout(Unknown Source) at java.awt.Container.doLayout(Unknown Source) at java.awt.Container.validateTree(Unknown Source) at java.awt.Container.validateTree(Unknown Source) at java.awt.Container.validate(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)