FLV Player Issue

programming flash
1

On my time line I have 5 frames for 5 different pages on the site. Frame 1 I have an empty mc and a flv player that call this code and everything works fine:

//empty clip
var mc_empty:MovieClip = new MovieClip();
addChild(mc_empty);

//remove instance of the flv player on the stage and put it in the empty mc
var myPlayer:FLVPlayback = flv_player;
removeChild(myPlayer);
mc_empty.addChild(myPlayer);

btn_alchemist.addEventListener(MouseEvent.CLICK, buttonClick);
btn_alchemist.addEventListener(MouseEvent.CLICK, populateAlchemist);

function populateAlchemist (evt:MouseEvent):void {
	
	textLoader.text_txt.text = "Title";
	textLoader.subText_txt.text = "Content"
	textLoader.link_txt.text = "Extra Content";
}
//function of flv player
function buttonClick(evt:MouseEvent):void{
    if(evt.target==btn_alchemist)
		myPlayer.source = "alchemist.flv";

Now when I try to put code on another frame I get the textLoader to work fine but I can not clear out and populate my flv player anymore. When I add this code in I keep getting output errors.

//empty clip
var mc_empty:MovieClip = new MovieClip();
addChild(mc_empty);

//remove instance of the flv player on the stage and put it in the empty mc
var myPlayer:FLVPlayback = flv_player;
removeChild(myPlayer);
mc_empty.addChild(myPlayer);
// add event to project buttons
btn_4XPress.addEventListener(MouseEvent.CLICK, buttonClick);
btn_4XPress.addEventListener(MouseEvent.CLICK, populate4XPress);

function populate4XPress (evt:MouseEvent):void {
	
	textLoader4.text_txt.text = "Title";
	textLoader4.subText_txt.text = "Content"
	textLoader4.link_txt.text = "Extra Content";
}

//function of flv player
function buttonClickXpress(evt:MouseEvent):void{
  	if(evt.target==btn_4XPress)
		myPlayer.source = "4XPress.flv";}

It says there is the conflict exists with definition mc_empty and myPlayer. How can I get around this? Thanks.