Instantiate Error (BCE0023)

Hey People,

I've been searching for about 2 hours for a solution, have checked and re-checked the example on the Unity Manual and look at a couple of example tutorials but to not avail.

I trying to create an object to appear multiple times and attach it to the scene manager. The code I've written so far looks like this

 //Enemy Counter
 var EnemyCounter : int = 0;
 //Variable for Random Y Co-Ordinate
 var EnemyY          : int = 0;
 
 //Variable created for Enemy
 var EnemyBody      : Transform;
 
 function Start () {
 }
 
 function Update () {
 
 EnemyY = Random.Range(-17,17);
 
 if(EnemyCounter == 0){
     Instantiate(EnemyBody, Vector3(20,EnemyY,0),0);
     EnemyCounter = 40;
     }

Yet I'm getting this error

BCE0023: No appropriate version of 'UnityEngine.Object.Instantiate' for the argument list '(UnityEngine.Transform, UnityEngine.Vector3, int)' was found.

Any help would be greatly appreciated