java.util.ConcurrentModificationException
   at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
   at java.util.ArrayList$Itr.next(ArrayList.java:851)
   at org.netbeans.modules.cnd.editor.folding.CppFoldManager.collectFoldUpdates(CppFoldManager.java:263)
   at org.netbeans.modules.cnd.editor.folding.CppFoldManager.updateFolds(CppFoldManager.java:158)
   at org.netbeans.modules.cnd.editor.folding.CppFoldManager.run(CppFoldManager.java:365)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)