java.lang.IllegalArgumentException: Key contains code point U+0000
   at java.util.prefs.AbstractPreferences.get(AbstractPreferences.java:296)
   at java.util.prefs.AbstractPreferences.getBoolean(AbstractPreferences.java:531)
   at org.netbeans.core.windows.TopComponentTracker.load(TopComponentTracker.java:99)
   at org.netbeans.core.windows.PersistenceHandler.load(PersistenceHandler.java:126)
   at org.netbeans.core.windows.WindowSystemImpl.load(WindowSystemImpl.java:81)
   at org.netbeans.core.GuiRunLevel$InitWinSys.run(GuiRunLevel.java:229)
   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)