ActionScript 3.0 :: Error 1009 - Mouseover / Mouseout And Click

Aug 16, 2010

I am using CS5 - as3 and getting error
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at index_nutro_fla::MainTimeline/manageMouseOut()
My mouser over is a moveclip use to work fine but giving this error

Here is the code
stop();
import flash.display.MovieClip;
import flash.events.MouseEvent;
bk_btn.buttonMode=true;bk_btn.useHandCursor = true;
bk_btn.addEventListener(MouseEvent.MOUSE_DOWN,
[Code] .....

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