java.lang.AssertionError: Must not wait in AWT here
   at org.netbeans.modules.uihandler.UIHandler.waitFlushed(UIHandler.java:199)
   at org.netbeans.modules.uihandler.Installer.closing(Installer.java:972)
   at org.netbeans.core.startup.NbInstaller.closing(NbInstaller.java:702)
   at org.netbeans.ModuleManager.shutDownAsync(ModuleManager.java:1966)
   at org.netbeans.core.startup.ModuleSystem.shutDownAsync(ModuleSystem.java:347)
   at org.netbeans.core.NbLifeExit.doExit(NbLifeExit.java:134)
   at org.netbeans.core.NbLifeExit.run(NbLifeExit.java:94)
   at org.openide.util.Mutex.doEvent(Mutex.java:1343)
   at org.openide.util.Mutex.readAccess(Mutex.java:350)
   at org.netbeans.core.NbLifecycleManager.exit(NbLifecycleManager.java:210)
   at org.netbeans.core.NbLifecycleManager.exit(NbLifecycleManager.java:119)
   at org.netbeans.core.windows.view.ui.MainWindow$6.windowClosing(MainWindow.java:479)
   at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349)
   at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349)
   at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349)
   at java.awt.Window.processWindowEvent(Window.java:2045)
   at javax.swing.JFrame.processWindowEvent(JFrame.java:296)
   at java.awt.Window.processEvent(Window.java:2003)
   at java.awt.Component.dispatchEventImpl(Component.java:4860)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Window.dispatchEventImpl(Window.java:2713)
   at java.awt.Component.dispatchEvent(Component.java:4686)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
   at java.awt.EventQueue.access$000(EventQueue.java:101)
   at java.awt.EventQueue$3.run(EventQueue.java:666)
   at java.awt.EventQueue$3.run(EventQueue.java:664)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   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:680)
   at java.awt.EventQueue$4.run(EventQueue.java:678)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)