as3 Movieclip not going to selected frame: error

programming flash
1

So in my game I have a ketchup button that when its click creats a ketchup movieclip that attaches to the cursor. What I want is for when you click on the buns with the ketchup cursor it goes to the frame within the bunsmc called “ketchup”.

I keep getting this error and I have no idea how to fix it!
TypeError: Error #1034: Type Coercion failed: cannot convert ketchmc$ to flash.display.DisplayObject.
at bunsmc/ketchup()

package
{
 import flash.display.MovieClip;
 import flash.events.MouseEvent;
 
 
 public class bunsmc extends MovieClip
 {
  public function bunsmc() 
  {
   x = 267;
   y = 235;
   
   addEventListener(MouseEvent.MOUSE_OVER,hilight);
  }
  public function hilight (e:MouseEvent):void
  {
   gotoAndPlay("highlight");
   
   addEventListener(MouseEvent.MOUSE_OUT,plain);
  }
  public function plain (e:MouseEvent):void
  {
   gotoAndPlay("plain");
   
   var blnTrip2:Boolean = true;
   addEventListener(MouseEvent.CLICK,ketchup);
  }
  var ketchMC =  ketchmc;
     function ketchup (e:MouseEvent):void
  {
   
   if(stage.contains(ketchMC)&& blnTrip2)
   {
    trace("yay");
    stage.removeEventListener(MouseEvent.CLICK,ketchup);
    blnTrip = false;
    
    
    
   }
  }
 }
}

what am I doing worng?
and suggestions on how to fix this and make it work??