java.lang.AssertionError: AWT
	at org.openide.text.CloneableEditorSupport.getOpenedPanes(CloneableEditorSupport.java:836)
	at org.netbeans.modules.languages.fold.LanguagesNavigator.refresh(LanguagesNavigator.java:184)
	at org.netbeans.modules.languages.fold.LanguagesNavigator.access$200(LanguagesNavigator.java:83)
	at org.netbeans.modules.languages.fold.LanguagesNavigator$DocumentListener.parsed(LanguagesNavigator.java:592)
	at org.netbeans.modules.languages.ParserManagerImpl.setChange(ParserManagerImpl.java:126)
	at org.netbeans.modules.languages.ParserManagerImpl.parseAST(ParserManagerImpl.java:154)
	at org.netbeans.modules.languages.ParserManagerImpl.access$100(ParserManagerImpl.java:54)
	at org.netbeans.modules.languages.ParserManagerImpl$1.run(ParserManagerImpl.java:110)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:541)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:963)