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java.lang.NullPointerException at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.grabContainer(Unknown Source) at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.requestAddGrab(Unknown Source) at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.stateChanged(Unknown Source) at javax.swing.MenuSelectionManager.fireStateChanged(Unknown Source) at javax.swing.MenuSelectionManager.setSelectedPath(Unknown Source) at javax.swing.JPopupMenu.setVisible(Unknown Source) at javax.swing.JPopupMenu.show(Unknown Source) at javax.swing.plaf.basic.BasicComboPopup.show(Unknown Source) at javax.swing.plaf.basic.BasicComboPopup.togglePopup(Unknown Source) at javax.swing.plaf.basic.BasicComboPopup$InvocationMouseHandler.mousePressed(Unknown Source) at java.awt.AWTEventMulticaster.mousePressed(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(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.pumpOneEventForHierarchy(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)