Actionscript 3 AS3#1063:Sym01（）上的变量计数不匹配应为0，得到1

我试图在舞台上添加一个符号，但出现了参数错误

我的代码：

symHolder.mc.sym01_mc.addEventListener(MouseEvent.MOUSE_DOWN, startDragHandler);

function startDragHandler(event:MouseEvent):void {
    var ClassReference:Class = getDefinitionByName("Sym" + event.target.name.charAt(3) + event.target.name.charAt(4)) as Class;
    var s:MovieClip = (new ClassReference("s" + num) as MovieClip);
    s.x = mouseX;
    s.y = mouseY;
    toggleSymHolder(null);
    addChild(s);
    s.name = "s" + num;
    stage.addEventListener(MouseEvent.MOUSE_UP, stopDragHandler);
    s.startDrag();
    s.addEventListener(MouseEvent.MOUSE_DOWN, nextDrag);
    num ++;
}

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类构造函数是否接受任何参数？如果没有，请从构造函数中删除

“s”+num

(new ClassReference("s" + num) as MovieClip); 

应该是：

(new ClassReference() as MovieClip);