JavaScript Error

I have a JavaScript that whenever i press a button, in this case "j", it will play an animation (walk). But whenever i use the script on a FPS Controller in standard assets, it says all compile errors must be fixed before entering playmode.

 function Update()
 {
     if(Input.GetKeyDown("w"))
     {
         // Plays the walk animation - stops all other animations
         animation.Play("walk", Playmode.StopAll);
     }
 }

Does anyone know how to fix it?