java.lang.AssertionError: Unregister asymmetrically called at org.openide.explorer.view.ViewTooltips.unregister(ViewTooltips.java:130) at org.openide.explorer.view.TreeView$ExplorerTree.removeNotify(TreeView.java:1801) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at org.openide.explorer.view.TreeView.removeNotify(TreeView.java:678) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at org.netbeans.swing.tabcontrol.TabbedContainer.removeNotify(TabbedContainer.java:943) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at java.awt.Container.removeNotify(Container.java:2609) at javax.swing.JComponent.removeNotify(JComponent.java:4701) at java.awt.Container.remove(Container.java:1140) at java.awt.Container.remove(Container.java:1198) at org.netbeans.core.windows.view.ui.DesktopImpl.setViewComponent(DesktopImpl.java:154) at org.netbeans.core.windows.view.ui.DesktopImpl.setSplitRoot(DesktopImpl.java:134) at org.netbeans.core.windows.view.ViewHierarchy.setSplitRootIntoDesktop(ViewHierarchy.java:628) at org.netbeans.core.windows.view.ViewHierarchy.releaseAll(ViewHierarchy.java:544) at org.netbeans.core.windows.view.DefaultView.hideWindowSystem(DefaultView.java:608) at org.netbeans.core.windows.view.DefaultView.windowSystemVisibilityChanged(DefaultView.java:500) at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:180) at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:269) at org.netbeans.core.windows.ViewRequestor.processVisibilityRequest(ViewRequestor.java:258) at org.netbeans.core.windows.ViewRequestor.postVisibilityRequest(ViewRequestor.java:195) at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:117) at org.netbeans.core.windows.Central.setVisible(Central.java:119) at org.netbeans.core.windows.WindowManagerImpl.setVisible(WindowManagerImpl.java:785) at org.netbeans.core.windows.WindowSystemImpl.hide(WindowSystemImpl.java:89) at org.netbeans.core.NbLifecycleManager$ExitActions.run(NbLifecycleManager.java:127) at org.netbeans.ModuleManager.shutDown(ModuleManager.java:1590) at org.netbeans.core.startup.ModuleSystem.shutDown(ModuleSystem.java:298) at org.netbeans.core.NbLifecycleManager.doExit(NbLifecycleManager.java:164) at org.netbeans.core.NbLifecycleManager.access$000(NbLifecycleManager.java:72) at org.netbeans.core.NbLifecycleManager$ExitActions.run(NbLifecycleManager.java:120) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:130) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)