Why am I getting an error?

so have 1 drop box , 5 draggable items. 1 can match drop box because contains word target , draggable item's name in variable (i.e. targetitem1). when user drags anying 1st item box bounce , tells them try again. having issue of, when user drags right answer box, 'next' button appears, user clicks on , of dragable items not visible. did debug , gave me error @ line after gotoandplay. doing wrong? working earlier today.

 

stop();

 

next_btn.visible = false;

 

spots1a1.buttonmode = true;
spots1a2.buttonmode = true;
spots1a3.buttonmode = true;
spots1a4.buttonmode = true;
spots1a5.buttonmode = true;

 

spots1a1.addeventlistener(mouseevent.mouse_down, pickup2);
spots1a1.addeventlistener(mouseevent.mouse_up, dropit2);
spots1a2.addeventlistener(mouseevent.mouse_down, pickup2);
spots1a2.addeventlistener(mouseevent.mouse_up, dropit2);
spots1a3.addeventlistener(mouseevent.mouse_down, pickup2);
spots1a3.addeventlistener(mouseevent.mouse_up, dropit2);
spots1a4.addeventlistener(mouseevent.mouse_down, pickup2);
spots1a4.addeventlistener(mouseevent.mouse_up, dropit2);
spots1a5.addeventlistener(mouseevent.mouse_down, pickup2);
spots1a5.addeventlistener(mouseevent.mouse_up, dropit2);

 

function pickup2(event:mouseevent):void {
    event.target.startdrag(true);
    answerlabel.text = "";
    event.target.parent.addchild(event.target);
    startx = event.target.x;
    starty = event.target.y;
}
function dropit2(event:mouseevent):void {
    event.target.stopdrag();
    var mytargetname2:string = "target" + event.target.name;
    var mytarget2:displayobject = getchildbyname(mytargetname2);
    if (event.target.droptarget != null && event.target.droptarget.parent == mytarget2){
        answerlabel.text = "good job!";
        event.target.removeeventlistener(mouseevent.mouse_down, pickup2);
        event.target.removeeventlistener(mouseevent.mouse_up, dropit2);
        event.target.buttonmode = false;
        event.target.x = mytarget2.x;
        event.target.y = mytarget2.y;
        next_btn.visible = true;
    } else {
        answerlabel.text = "try again!";
        event.target.x = startx;
        event.target.y = starty;
    }
}
          import flash.events.mouseevent;
          next_btn.addeventlistener(mouseevent.click, powerclick28);
          function powerclick28(event:mouseevent):void {
          gotoandplay(1009);
          spots1a1.visible = false;
          spots1a2.visible = false;
          spots1a3.visible = false;
          spots1a4.visible = false;
          spots1a5.visible = false;

}

what error getting?  not should matter since code should execute, should take care of putting things away before gotoandplay anywhere

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