ActionScript 3.0 :: Can't Access Button With Instance Name

Sep 14, 2009

In my timeline I have a button, with an instance name of view_only_button. On my actions layer, I have code that is attempting to add a listener for a MOUSE_DOWN event. The frame that has the button is the same as where the actionscript is going, but of course it is two different layers. When I try accessing the variable by the code below, I get the error:

Error #1009: Cannot access a property or method of a null object reference.

ActionScript Code:
view_only_button.addEventListener(MouseEvent.MOUSE_DOWN, viewOnlyDownHandler);
function viewOnlyDownHandler(event:MouseEvent):void{
//Code to execute inside of the event call
}

When commenting the addEventListener line out, the error goes away. I am unsure why this would issue an error

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