Console Error

Please help this is the error I got well playing my game.

NullReferenceException: Object reference not set to an instance of an object
Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.String cacheKeyName, System.Type cacheKeyTypes, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.Object args, System.String cacheKeyName, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.Invoke (System.Object target, System.String name, System.Object args)
UnityScript.Lang.UnityRuntimeServices.Invoke (System.Object target, System.String name, System.Object args, System.Type scriptBaseType)
Turret Control.Shoot () (at Assets/_Scripts/Turret Control.js:24)
Turret Control.Update () (at Assets/_Scripts/Turret Control.js:15)

My Script is supposed to have a turret look at my character, and shoot one fireball a second, but it is spraying like crazy!
Here is my code

var LookAtTarget : GameObject;
var damp = 6.0;
var bulletPrefab : Transform;
var savedTime=0;

function Update ()
{
if(LookAtTarget)
{
var rotate = Quaternion.LookRotation(LookAtTarget.position - transform.position);

	transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp);
	
	var seconds : int = Time.time;
	var oddeven = (seconds % 2);
	
	if(oddeven)
	{
		Shoot(seconds);
	}
}

}
function Shoot(seconds)
{
if(seconds!=savedTime)
{
var bullet = Instantiate(bulletPrefab, transform.Find(“SpawnPoint1”).transform.position, Quaternion.identity);

	bullet.rigidbody.AddForce(transform.forward * 1000);
	
	savedTime=seconds;
}

All you have to do is track when the last time you fired a shot was, and the shoot again if it’s been at least as long as your interval.

var lastShootTime = 0;
var shootInterval = 2;

//shoot code
if (lastShootTime + shootInterval >= Time.time)
{
    // shoot a fireball
    lastShootime = Time.time;
}