My health script is not working and i can't find the solution. The problem is that if I hit the enemy (a cube for example) with the bullet he won't die/disappear.

This is my health script

pragma strict

 var Health : int = 100;
 var bullet : GameObject;
 var damage : int = 25;
 
 function Update () 
 {
     if(Health < 0)
     {
         DIE();
     }
 }
 
 function OnTriggerEnter (hit : Collider) 
 {
     if(hit.gameObject.tag == "Bullet")
     {
         bullet = hit.gameObject; 
         TakeDamage ();
     }
 }
 
 function TakeDamage ()
 {
     var GunPreferences : Bullet = bullet.GetComponent("Bullet");
     damage = GunPreferences.Damage;
     Health -= damage;
 }
 
 function DIE ()
 {
     Debug.Log("I'm dead");
     Destroy(gameObject);
 }

My Gun Script

 var Bullet : Rigidbody;
 var Spawn : Transform; 
 var BulletSpeed : float = 1000;
 var ReloadTime : float = 2;
 var AmmoInMag: float = 30;
 var IsFullAuto = true;
 static var AmmoLeft : float;
 static var ReloadTTime : float;
 private var CanFire = true;
 var FireRate = 0.1;
 
 function Start () {
     AmmoLeft = AmmoInMag;
     ReloadTTime = ReloadTime;
 }
 
 function Update () {
     if(IsFullAuto == false){
         if(Input.GetButtonDown("Fire1")){
             if(AmmoLeft > 0){
                 BroadcastMessage("FireAnim");
                 Fire();
             }
         }
     }
     else{
         if(Input.GetButton("Fire1")){
             if(AmmoLeft > 0){
                 BroadcastMessage("FireAnim");
                 Fire();
             }
         }
     }
     
     if(AmmoLeft == 0)
     {
         Reload();
     }
     
     if(AmmoLeft < 0){
         AmmoLeft = 0;
     }
 }
 function Fire(){
     if(CanFire == true){
         var bullet1 : Rigidbody = Instantiate(Bullet,Spawn.position,Spawn.rotation);    
         bullet1.AddForce(bullet1.transform.forward *BulletSpeed);
         CanFire = false;
         yield WaitForSeconds(FireRate);
         CanFire = true;
         AmmoLeft -= 1;
         audio.Play();
     }
 }
 
 function Reload(){
     CanFire = false;
     BroadcastMessage("ReloadAnim");
     yield WaitForSeconds(ReloadTime);
     CanFire = true;
 }

Thanks in advance!!