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java.util.ConcurrentModificationException: 	at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711)	at java.util.LinkedHashMap$LinkedValueIterator.next(LinkedHashMap.java:739)	at org.netbeans.modules.javascript2.editor.model.impl.ModelVisitor6.createVarLetConst(ModelVisitor6.java:880)	at org.netbeans.modules.javascript2.editor.model.impl.ModelVisitor6.visitLexicalBinding(ModelVisitor6.java:431)	at org.netbeans.modules.javascript2.editor.model.impl.ModelVisitor6.visitLexicalBinding(ModelVisitor6.java:73)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6Parser$LexicalBindingContext.accept(ECMAScript6Parser.java:4753)	at org.netbeans.modules.javascript2.editor.model.impl.ModelVisitor6.visitLexicalDeclaration(ModelVisitor6.java:442)	at org.netbeans.modules.javascript2.editor.model.impl.ModelVisitor6.visitLexicalDeclaration(ModelVisitor6.java:73)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6Parser$LexicalDeclarationContext.accept(ECMAScript6Parser.java:4580)	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:70)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6BaseVisitor.visitDeclaration(ECMAScript6BaseVisitor.java:401)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6Parser$DeclarationContext.accept(ECMAScript6Parser.java:4265)	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:70)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6BaseVisitor.visitStatementList(ECMAScript6BaseVisitor.java:429)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6Parser$StatementListContext.accept(ECMAScript6Parser.java:4500)	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:70)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6BaseVisitor.visitProgramItem(ECMAScript6BaseVisitor.java:947)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6Parser$ProgramItemContext.accept(ECMAScript6Parser.java:9261)	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:70)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6BaseVisitor.visitProgram(ECMAScript6BaseVisitor.java:940)	at org.netbeans.modules.javascript2.editor.parser6.ECMAScript6Parser$ProgramContext.accept(ECMAScript6Parser.java:9196)	at org.netbeans.modules.javascript2.editor.model.Model.getModelVisitor(Model.java:182)	at org.netbeans.modules.javascript2.editor.model.Model.getGlobalObject(Model.java:506)	at org.netbeans.modules.javascript2.editor.index.JsIndexer.index(JsIndexer.java:105)	at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$3.run(Indexable.java:248)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:296)	at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:246)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:3210)	at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)	at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)	at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)	at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)	at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)	at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)	at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)	at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)	at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)	at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)	at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.indexEmbedding(RepositoryUpdater.java:3144)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2865)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$500(RepositoryUpdater.java:2157)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2639)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2637)	at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:565)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2637)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5705)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5613)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$4.run(RepositoryUpdater.java:2130)	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2126)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2107)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1200(RepositoryUpdater.java:157)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5740)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:5410)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:5028)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3410)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6174)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5825)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6090)	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)	at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6086)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6082)	at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)	at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)	at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)	at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6082)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at org.openide.util.RequestProcessor$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)