Why nothing happens???

I found the problem... Looks like the way I refere to the transform of the object at the function Start was wrong:

 gunBody = GameObject.Find("GunBody").transform;
 

But, why?

Here is the whole script:

 #pragma strict
 
 //General
 var health: float;
 var playerDist: float;
 var player: Transform;
 var spoted: boolean = false;
 
 //Attack
 var gunBody: Transform;
 var gun: Transform;
 var aimAssist: Transform;
 var aimAssistRot: float;
 var rotSpeed: float;
 var canShoot: boolean = false;
 var bullet: GameObject;
 var bulletSpeed: float;
 var smoke: ParticleSystem;
 var tail: ParticleSystem;
 
 //Chase
 var agent: NavMeshAgent;
 
 function Start(){
 tail = GameObject.Find("BulletSmoke").particleSystem;
 smoke = GameObject.Find("ShootSmoke").particleSystem;
 gunBody = GameObject.Find("GunBody").transform;
 gun = GameObject.Find("Gun").transform;
 aimAssist = GameObject.Find("AimAssist").transform;
 agent = GetComponent.<NavMeshAgent>();
 }
 
 function FixedUpdate () {
 aimAssist.LookAt(player.position);
 health = GetComponent(EnemyHealth).health;
 playerDist = Vector3.Distance(player.position, transform.position);
 
 if (health > 0){
     if(playerDist < 800)
         Attack();
     else if(spoted)
         Chase();
     if(playerDist > 800 && !spoted)
         Idle();
     if(playerDist && !spoted && Time.time > 1)
         ReSpawn();
 }
 }
 
 function Attack(){
 spoted = true;
 StartCoroutine("Aim");
     if(canShoot){
         canShoot = false;
         smoke.Play();
         bullet = new GameObject("Bullet");
         bullet.AddComponent("Rigidbody");
         bullet.AddComponent("SphereCollider");
         bullet.transform.position = gun.position;
         bullet.rigidbody.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;
         tail.SendMessage("Attach", SendMessageOptions.DontRequireReceiver);
         bullet.AddComponent("Bullet");
         bullet.rigidbody.freezeRotation = true;
         bullet.rigidbody.velocity = gun.TransformDirection(Vector3.down * bulletSpeed);
         StartCoroutine("Reload");
     }
 }
 
 function Aim(){
 gunBody.eulerAngles.y = aimAssist.eulerAngles.y;
 //gun.eulerAngles.x = aimAssist.eulerAngles.x;
 }
 
 function Reload(){
     yield WaitForSeconds(5);
     canShoot = true;
 }
 
 function Chase(){
 agent.SetDestination(player.position);
     if(Time.time > 5)
         Lost();
 }
 
 function Lost(){
     spoted = false;
 }
 
 function Idle(){
     transform.position = transform.position;
 }
 
 function ReSpawn(){
     if(playerDist > 700)
         transform.position = new Vector3(Random.Range(0, 10000), 0, Random.Range(0, 10000));
     else
         gameObject.SetActive(true);
 }