My gameobject won't be destroyed..

Questions & Answers
1

So…My gameobject won’t get destroyed. I can play the game just fine, but i got this error:

NullReferenceException: Object reference not set to an instance of an object
AxeAttack.Attack () (at Assets/Scripts/AxeAttack.js:47)
AxeAttack.Update () (at Assets/Scripts/AxeAttack.js:26)

Here is my health script:

#pragma strict
var axe : GameObject;
private var axeScript : AxeAttack;
var health : float = 100.0;

function Start ()
{
	axeScript = axe.GetComponent(AxeAttack);
}

function update ()
{
	if(health <= 0.0)
	{
		Dead();
	}
}

function ApplyDamage (damage : float)
{
	health -= axeScript.damage;
}

function Dead ()
{
	Destroy(gameObject);
}

And here is my axe script:

#pragma strict
private var isAttacking : boolean = true;
private var attackCoolDown = 0.0;
var damage = 50;
var range = 5;
var layerMask : LayerMask;
private var mainCamera : GameObject;
function Start () {
	isAttacking = false;
	mainCamera = GameObject.FindWithTag("MainCamera");
}

function Update () {
	if(isAttacking)
		{
			attackCoolDown += Time.deltaTime;
		
	if(attackCoolDown >= 2)
		{
			isAttacking = false;
			attackCoolDown = 0.0;
		}
	}
	if(Input.GetMouseButtonDown(0) && isAttacking == false)
		{	
			Attack();
		}
	if(isAttacking == false)
		{
			this.gameObject.animation["idle_cube"].wrapMode = WrapMode.Loop;
			this.gameObject.animation.CrossFade("idle_cube");
		}
}
function Attack ()
{	
	this.gameObject.animation.CrossFade("attack_cube");
	isAttacking = true;
	attackCoolDown = 1;
	var direction = transform.TransformDirection(Vector3.forward); 
	var hit : RaycastHit;
	
	Debug.DrawLine(mainCamera.transform.position,direction*range,Color.red);
	
	
	if (Physics.Raycast (mainCamera.transform.position, direction, hit, range, layerMask));
	{
		if(hit.transform.tag == "Enemy")
		{
		
			hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
		}
	}

	
}
2

Update, not update. Capitalization matters.