Why is my player not being found after being respawned

Here is my script:

 var Distance;
 var Target : GameObject;
 var lookAtDistance = 25.0;
 var chaseRange = 15.0;
 var attackRange = 1.5;
 var moveSpeed = 5.0;
 var Damping = 6.0;
 var attackRepeatTime = 1;
 var MaxHealth = 100;
 var Health : int;
 
 var TheDammage = 40;
 
 private var attackTime : float;
 
 var controller : CharacterController;
 var gravity : float = 20.0;
 var rigidbdy : Component;
 private var MoveDirection : Vector3 = Vector3.zero;
 
 function Awake () {
     Target = Resources.Load("Player/FPScontroller 1", GameObject) as GameObject;
 }
 
 function Start ()
 {
     attackTime = Time.time;
     Health = MaxHealth;
     GetComponent.<Rigidbody>().isKinematic = true;
     GetComponent.<Rigidbody>().detectCollisions = false;
 
 }
 
 function Update ()
 {
     if(RespawnMenuV2.playerIsDead == false)
     {
         Distance = Vector3.Distance(Target.transform.position, transform.position);
         
         if (Distance < lookAtDistance)
         {
             lookAt();
         }
         
         if (Distance > lookAtDistance)
         {
             GetComponent.<Renderer>().material.color = Color.green;
         }
         
         if (Distance < attackRange)
         {
             attack();
         }
         else if (Distance < chaseRange)
         {
             chase ();
         }
     }
 }
 
 
 function ApplyDammage (TheDammage : int)
     {
         Health -= TheDammage;
         if(Health <= 0)
         {
             Dead();
         }
     }
 function Dead()
     {
         GetComponent.<Rigidbody>().isKinematic = false;
         GetComponent.<Rigidbody>().detectCollisions = true;
         PlayerStatsV2.zombieskilled ++;
         PlayerHumanity.humanity ++;
         Destroy(this);
     }
 function lookAt ()
 {
     GetComponent.<Renderer>().material.color = Color.yellow;
     var rotation = Quaternion.LookRotation(Target.transform.position - transform.position);
     transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);
 }
 
 function chase ()
 {
     GetComponent.<Renderer>().material.color = Color.red;
     
     moveDirection = transform.forward;
     moveDirection *= moveSpeed;
     
     moveDirection.y -= gravity * Time.deltaTime;
     controller.Move(moveDirection * Time.deltaTime);
 }
 
 function attack ()
 {
     if (Time.time > attackTime)
     {
         Target.SendMessage("ApplyDammage", TheDammage);
         Debug.Log("The Enemy Has Attacked");
         attackTime = Time.time + attackRepeatTime;
     }
 }
 
 function ApplyDammage ()
 {
     chaseRange += 30;
     moveSpeed += 2;
     lookAtDistance += 40;
 }

I get this error loads of times:

 NullReferenceException: Object reference not set to an instance of an object
 AdvancedAIV2.Update () (at Assets/Zombies/AI/AdvancedAIV2.js:38)