java.lang.IllegalArgumentException: Wrong format of mind map, end of header is not found
   at com.igormaznitsa.mindmap.model.MindMap.<init>(MindMap.java:105)
   at com.igormaznitsa.nbmindmap.nb.navigator.MMDNavigator.updateContent(MMDNavigator.java:156)
   at com.igormaznitsa.nbmindmap.nb.navigator.MMDNavigator.extractDataFromContextAndUpdate(MMDNavigator.java:136)
   at com.igormaznitsa.nbmindmap.nb.navigator.MMDNavigator.panelActivated(MMDNavigator.java:106)
   at org.netbeans.modules.navigator.LazyPanel.panelActivated(LazyPanel.java:100)
   at org.netbeans.modules.navigator.NavigatorController.showProviders(NavigatorController.java:508)
   at org.netbeans.modules.navigator.NavigatorController.access$400(NavigatorController.java:101)
   at org.netbeans.modules.navigator.NavigatorController$1$1.run(NavigatorController.java:421)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:717)
   at java.awt.EventQueue$3.run(EventQueue.java:711)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:89)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:199)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)