Issues with referencing a variable from a parent script.

Unity Engine
1

So im having trouble accessing a variable from another script. its weird that its not working because according to all the searching i have done it should be properly pulling the target variable from a different script. I have tried coding this several different ways and nothing seems to be working for me.

What i have is a tower in my scene, when an enemy moves close enough it acquires the target and fires a projectile at it with a certain speed and direction

I want the projectile to constantly rotate towards the target since it is moving
when i try and access this variable from the other script i keep getting this error in my console

NullReferenceException: Object reference not set to an instance of an object

to me it looks like my code never actually sets the projectileTarget variable to the target variable of the tower

here is my code for review

thanks in advance

script for the projectile

var explosionPrefab : Transform;
var projectileTarget : Transform;


function OnCollisionStay()
{
	Instantiate(explosionPrefab, transform.position, Quaternion.identity);
	Destroy(gameObject);
	
}

function Update()
{
	transform.LookAt(projectileTarget);

}


function Awake()
{
    var towerScript : TowerAttack;
    towerScript = GetComponent("TowerAttack");
    projectileTarget = towerScript.target;
}

TowerAttack script

var projectileOfTower : Transform;
var projectileSpeed = 20000;
var target : Transform;
var towerRange = 100;
var towerAttackRate = 1.0;
var doneAttacking = true;
var projectile : Transform;

function Awake()
{
	//set target
	target = GameObject.FindWithTag("Enemy").transform;
	print("target aquired");
}




function Update () 
{
			
	//check if the target is in range
	if((Vector3.Distance(transform.position, target.position)) < towerRange)
	{
		//look at target
		transform.LookAt(Vector3(target.position.x,0, target.position.z));
		
		if(doneAttacking)
		{

		//fire
		AttackTarget();
		
		//wait till tower is off cooldown
		TowerCooldown();
		
		}//end doneAttacking
						
	}//end Distance
		
		
}//end update




function AttackTarget()
{
		// fire the projectile		
		projectile = Instantiate(projectileOfTower, transform.position, Quaternion.identity);	
		projectile.rigidbody.AddForce(transform.forward * projectileSpeed);
		projectile.transform.LookAt(target);
			
}

function TowerCooldown()
{
	doneAttacking = false;
	yield WaitForSeconds(towerAttackRate);	
	doneAttacking = true;
}
2

you have to put static in front of the variable you want to be read from other scripts

static var target : Transform;

3

that worked. thanks a ton