Concating a variable + Coercion error

programming flash
1

I’m trying to form an instance name dynamically.


        var a:Array=[];	
	a=targetName.split("_");			
	turntoID = a[0]+1;
	var popup = stage.addChild(["popUpMessage"+turntoID]);

But I get this error:

1067: Implicit coercion of a value of type Array to an unrelated type flash.display:DisplayObject.

Any ideas?