Почему выдает ошибку 119

[cucumber007]

Почему на такой код:

var AddBlock = new Sprite()
AddBlock.graphics.lineStyle(0, 0x000000)
AddBlock.graphics.beginFill(0x0FAFD7)
AddBlock.graphics.drawRect(300,600 , 100,  48)
addChild(AddBlock)
 
AddBlock.addEventListener(MouseEvent.MOUSE_CLICK, AddBlockAction)
 
function AddBlockAction (e) {
 
 trace(stageX)
 
}

выдает ошибку 1119: Access of possibly undefined property MOUSE_CLICK through a reference with static type Class.