ActionScript 3.0 :: TypeError: Error #1034 While Adding A Child To Screen

I am attempting to add a child to the stage with the following code:

Actionscript Code:
//Buttons: Adds movie clip to stage.readtomeShortA1.addEventListener(MouseEvent.CLICK, playShortAReadMe1);function playShortAReadMe1(e:TimerEvent):void{  var playShortA1:ShortAReadMe1 = new ShortAReadMe1  addChild(playShortA1);  playShortA1.x = 307;  playShortA1.y = 603;}

When I test the movie the following message appears,

"TypeError: Error #1034: Type Coercion failed:cannot convert flash.events::MouseEvent@212a161 to flash.events.TimerEvent," when I click the button ("readtomeShortA1"). Note the instance I am referring to is a button. When the swf is created there are compile errors that appear. The "TypeError....." only happens when I click on the button ("readtomeShortA1").

FYI, there is other code on the page which is below the code in question:

Actionscript Code:
//Button CodebackTo.addEventListener(MouseEvent.CLICK, backToShortA);function backToShortA(event:MouseEvent):void{  gotoAndPlay(1); SoundMixer.stopAll();}ForwardTo2.addEventListener(MouseEvent.CLICK, toPage2);function toPage2(event:MouseEvent):void{ gotoAndPlay("page_2"); SoundMixer.stopAll();}