Class.as

private var myText:TextField; // move the var to class-level
		// if you create var inside function it not be visible in another function
		
		private function init(e:Event = null):void {
			removeEventListener(Event.ADDED_TO_STAGE, init);
			trace('stage has been found')
			stage.addEventListener(KeyboardEvent.KEY_DOWN, EnterStart);
			myText = new TextField();
			myText.text = "Republic of Code";
			addChild(myText);
		
		}
		
		private function EnterStart(e:KeyboardEvent):void {
			stage.removeEventListener(KeyboardEvent.KEY_DOWN, EnterStart);
			trace('enter has been pressed')
			//var myText:TextField; // equals null
			//remove this var from here
			
			if (e.keyCode == 13) {
				gameStart();
				
				removeChild(myText);
				
			} else {
				init();
			}
		}