actionscript 3 - null object error - button trying to play child movie -


have button needs play movie within movie.

btn1871.addeventlistener(mouseevent.click, fl_mouseclickhandler_2); function fl_mouseclickhandler_2(event:mouseevent):void { slides_mc.slide1871.gotoandplay("slide1871"); }

and get: 

typeerror: error #1009: cannot access property or method of null object reference. @ mc_fla::maintimeline/fl_mouseclickhandler_2()

and idea? thx.


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