java.lang.AssertionError: Negative length.
 addFold1 ENTER, rootFold = [root-fold] E <0,2380>, hash=0x937613e, [0, 2380] {0, 2380}
 addFold2 nextIndex:1 index:1
 addFold5 nextIndex += prevFold.getFoldCount() nextIndex:6 index:1
 addFold6 nextIndex-- nextIndex:5 index:6
 addFold8 INVOKE ApiPackageAccessor.get().foldExtractToChildren index:6 nextIndex:5 diff:-1 parentFold.getFoldCount():5
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.addFold(FoldHierarchyTransactionImpl.java:810)
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.addFold(FoldHierarchyTransactionImpl.java:534)
   at org.netbeans.modules.editor.fold.FoldHierarchyExecution.add(FoldHierarchyExecution.java:357)
   at org.netbeans.modules.editor.fold.FoldOperationImpl.addToHierarchy(FoldOperationImpl.java:185)
   at org.netbeans.spi.editor.fold.FoldOperation.addToHierarchy(FoldOperation.java:140)
   at org.netbeans.modules.web.core.syntax.folding.JspFoldManager$3.run(JspFoldManager.java:431)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
   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.awt.EventQueue.dispatchEvent(EventQueue.java:675)
   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)