"Target Collision" script. coconut

I have several weeks taking the book (Game Development Essentials), but now I'm stuck, with the "Target Collision" script.

Yesterday I saw the erratas book and I found out that someone else has the same problem and he solve it the same problem so I took his script but nothing happens.

I did exactly as the book said.

Please see my screenshots and the script. is there any errors?

 #pragma strict
 
 private var beenHit : boolean = false;
 private var targetRoot : Animation;
 var hitSound : AudioClip;
 var resetSound : AudioClip;
 var resetTime : float = 3.0;
 
 function Start() {
 targetRoot = transform.parent.transform.animation;
 }
 function OnCollisionEnter(theObject : Collision){
 if (beenHit==false && theObject.gameObject.name=="coconut"){
 StartCoroutine("targetHit");
 }
 }
 
 function targetHit(){
 audio.PlayOneShot(hitSound);
 targetRoot.Play("down");
 beenHit=true;
 
 yield new WaitForSeconds(resetTime);
 
 audio.PlayOneShot(resetSound);
 targetRoot.Play("up");
 beenHit=false;
 }
 @script RequireComponent(AudioSource)

Thanks