asdoc dies on Event.CLOSING

for reason asdoc doesn't closing property of event.  how can rid of error?  i'm using asdoc same sdk project built with

 

windowedapplicationcontainer.as(60): col: 39 error: access of possibly undefined property closing through reference static type class.

 

                    _mainview.addeventlistener(event.closing,applicationclosing);

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