Turret aimming is off.

I am having an issue with aiming of my turret. The turret seems to be aiming and shooting right above the cube (enemy). I believe the problem is somewhere in this code.

 function CalculateAimPosition(targetPos : Vector3){
     
     var aimPoint = Vector3(targetPos.x-transform.position.x+aimError, targetPos.y-transform.position.y+aimError, targetPos.z-transform.position.z+aimError);
     
     desiredRotation = Quaternion.LookRotation(aimPoint);
     
     }

I tried using Quaternion.LookAt(pos) but the turret would rotate incorrectly. I give up trying to figure this out, if anyone has ideas please let me know. I just want it to shoot and hit that darn cube… . . . .

Here is my turret code if you see something else that can be changed

   var myProjectile : GameObject;
     var reloadTime : float = 1f;
     var turnSpeed : float = 5f;
     var firePauseTime : float = .25f;
     var muzzleEffect : GameObject;
     var errorAmount : float = .001;
     var myTarget : Transform;
     var muzzlePositions : Transform[];
     var turretBall : Transform;
     
     private var nextFireTime : float;
     private var nextMoveTime : float;
     private var desiredRotation : Quaternion;
     private var aimError : float;
 
      
      
     function Start ()
     {
   
     }
     function Update ()
     {
     if(myTarget)
     {
     if(Time.time >= nextMoveTime)
     {
     CalculateAimPosition(myTarget.position-transform.position);
     turretBall.rotation = Quaternion.Lerp(turretBall.rotation, desiredRotation, Time.deltaTime*turnSpeed);
      
     }
      
     if(Time.time >= nextFireTime)
     {
     FireProjectile();
      
     }
     }
     }
      
     function OnTriggerEnter(other : Collider)
     {
     if(other.gameObject.tag == "Enemy")
     {
     nextFireTime = Time.time+(reloadTime*.5);
     myTarget = other.gameObject.transform;
     }
     }
      
     function OnTriggerExit(other : Collider)
     {
     if(other.gameObject.transform == myTarget)
     {
     myTarget = null;
     }
     }
      
       function CalculateAimPosition(targetPos : Vector3)
     {
 
     
     var aimPoint = Vector3(targetPos.x-transform.position.x+aimError, targetPos.y-transform.position.y+aimError, targetPos.z-transform.position.z+aimError);
     desiredRotation = Quaternion.LookAt(aimPoint);
 }
 
 
      
     function CalculateAimError()
     {
     aimError= Random.Range(-errorAmount, errorAmount);
     }
     function FireProjectile(){
      
     audio.Play();
     nextFireTime = Time.time+reloadTime;
     nextMoveTime = Time.time+firePauseTime;
     CalculateAimError();
      
     for(theMuzzlePos in muzzlePositions)
     {
     
     //Instantiate(myProjectile, theMuzzlePos.position, theMuzzlePos.rotation);
      //Instantiate(muzzleEffect, theMuzzlePos.position, theMuzzlePos.rotation);
     var go = Instantiate(myProjectile, theMuzzlePos.position, theMuzzlePos.rotation);
     go.rigidbody.AddRelativeForce(Vector3.forward * 20000);
     }
     }