Expecting rightparen before colon

I am making a turn based rpg game in actionscript 3 but I am a beginner and I am having some problems.

error 1084: expecting rightparen before colon.

Here is my code:

import flash.events.MouseEvent;

stop();

next.addEventListener(MouseEvent.CLICK, nextbutton)

function nextbutton(event:MouseEvent):void

{

          nextFrame()

          addChildAt(Fight:DisplayObject, frame:9);DisplayObject - DisplayObjectContainer

          stop();

}