java.lang.AssertionError
   at org.openide.text.CloneableEditor$DoInitialize.initNonVisual(CloneableEditor.java:628)
   at org.openide.text.CloneableEditor$DoInitialize.run(CloneableEditor.java:367)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1493)
   at org.openide.text.CloneableEditor$DoInitialize.<init>(CloneableEditor.java:332)
   at org.openide.text.CloneableEditor.initialize(CloneableEditor.java:248)
   at org.openide.text.CloneableEditor.componentShowing(CloneableEditor.java:223)
   at org.netbeans.core.spi.multiview.text.MultiViewCloneableEditor.componentShowing(MultiViewCloneableEditor.java:143)
   at org.netbeans.core.spi.multiview.text.MultiViewEditorElement.componentShowing(MultiViewEditorElement.java:134)
   at org.netbeans.core.multiview.MultiViewPeer.peerComponentShowing(MultiViewPeer.java:277)
   at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentShowing(MultiViewCloneableTopComponent.java:129)
   at org.openide.windows.WindowManager.componentShowing(WindowManager.java:339)
   at org.netbeans.core.windows.WindowManagerImpl.componentShowing(WindowManagerImpl.java:1163)
   at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:168)
   at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:273)
   at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:249)
   at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:187)
   at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:127)
   at org.netbeans.core.windows.Central.setModeSelectedTopComponent(Central.java:743)
   at org.netbeans.core.windows.Central.userActivatedTopComponent(Central.java:1917)
   at org.netbeans.core.windows.view.DefaultView.userSelectedTab(DefaultView.java:680)
   at org.netbeans.core.windows.view.ui.TabbedHandler.stateChanged(TabbedHandler.java:302)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.netbeans.core.windows.view.ui.tabcontrol.AbstractTabbedImpl.fireStateChanged(AbstractTabbedImpl.java:500)
   at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter$1.stateChanged(TabbedAdapter.java:81)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:133)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:119)
   at org.netbeans.swing.tabcontrol.plaf.DefaultTabSelectionModel.setSelectedIndex(DefaultTabSelectionModel.java:111)
   at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.performCommand(BasicTabDisplayerUI.java:770)
   at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.potentialCommand(BasicTabDisplayerUI.java:759)
   at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.mousePressed(BasicTabDisplayerUI.java:734)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.Component.processMouseEvent(Component.java:6502)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
   at java.awt.Component.processEvent(Component.java:6270)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4861)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4489)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2713)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   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:158)
   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)