Help! Disappearing text on MouseOver tween


i’m out of luck and can’t figure out myself why this happen.
I have a linked movieclip in my library that contains a dynamic text field.
I edit this text via my external class but when I tween my MC, the text just disappears !!
What wrong ?? Please.

        var goTo1:_goTo1= new _goTo1();
        goTo1.buttonMode = true;
        goTo1.mouseEnabled = true;
        goTo1.linkText.text = "Example";
        goTo1.addEventListener(MouseEvent.MOUSE_OVER, goToOver);
        goTo1.addEventListener(MouseEvent.MOUSE_OUT, goToOut);
        goTo1.addEventListener(MouseEvent.MOUSE_UP, goToURL);

    public function goToOver(event:MouseEvent):void { 
        Tweener.addTween(, {x:920, time:0.35, transition:"linear"});

Thanks thanks thanks. I’m stuck on this.