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java.lang.NullPointerException: 	at org.freeplane.view.swing.ui.mindmapmode.GlassPaneManager.ancestorAdded(GlassPaneManager.java:58)	at javax.swing.AncestorNotifier.fireAncestorAdded(AncestorNotifier.java:85)	at javax.swing.AncestorNotifier.componentShown(AncestorNotifier.java:192)	at java.awt.AWTEventMulticaster.componentShown(AWTEventMulticaster.java:179)	at java.awt.Component.processComponentEvent(Component.java:6348)	at java.awt.Component.processEvent(Component.java:6296)	at java.awt.Container.processEvent(Container.java:2229)	at java.awt.Window.processEvent(Window.java:2022)	at java.awt.Component.dispatchEventImpl(Component.java:4872)	at java.awt.Container.dispatchEventImpl(Container.java:2287)	at java.awt.Window.dispatchEventImpl(Window.java:2719)	at java.awt.Component.dispatchEvent(Component.java:4698)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)	at java.awt.EventQueue.access$200(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:694)	at java.awt.EventQueue$3.run(EventQueue.java:692)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)	at java.awt.EventQueue$4.run(EventQueue.java:708)	at java.awt.EventQueue$4.run(EventQueue.java:706)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)