javax.swing.undo.CannotUndoException
   at javax.swing.undo.AbstractUndoableEdit.undo(AbstractUndoableEdit.java:110)
   at javax.swing.undo.CompoundEdit.undo(CompoundEdit.java:59)
   at org.openide.text.UndoRedoManager.undoSaveActions(UndoRedoManager.java:282)
   at org.openide.text.UndoRedoManager.beforeRedoAtSavepoint(UndoRedoManager.java:318)
   at org.openide.text.WrapUndoEdit.redo(WrapUndoEdit.java:114)
   at org.openide.awt.UndoRedo$Manager.redoTo(UndoRedo.java:293)
   at org.openide.awt.UndoRedo$Manager.redo(UndoRedo.java:263)
   at org.openide.text.UndoRedoManager.access$101(UndoRedoManager.java:98)
   at org.openide.text.UndoRedoManager$DocLockedRun.run(UndoRedoManager.java:654)
   at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:321)
   at org.openide.text.UndoRedoManager$DocLockedRun.<init>(UndoRedoManager.java:632)
   at org.openide.text.UndoRedoManager$DocLockedRun.<init>(UndoRedoManager.java:624)
   at org.openide.text.UndoRedoManager$DocLockedRun.<init>(UndoRedoManager.java:620)
   at org.openide.text.UndoRedoManager.redo(UndoRedoManager.java:428)
   at org.netbeans.core.multiview.MultiViewPeer$DelegateUndoRedo.redo(MultiViewPeer.java:954)
   at org.openide.actions.RedoAction.performAction(RedoAction.java:112)
   at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:129)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)
   at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)
   at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99)
   at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:126)
   at org.netbeans.modules.editor.NbEditorKit$NbRedoAction.actionPerformed(NbEditorKit.java:594)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:339)
   at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1664)
   at javax.swing.JComponent.processKeyBinding(JComponent.java:2878)
   at javax.swing.JComponent.processKeyBindings(JComponent.java:2925)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2841)
   at java.awt.Component.processEvent(Component.java:6282)
   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.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
   at java.awt.Component.dispatchEventImpl(Component.java:4731)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Window.dispatchEventImpl(Window.java:2719)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   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:708)
   at java.awt.EventQueue$4.run(EventQueue.java:706)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)