BCE0019: 'Add' is not a member of 'UnityEngine.Transform[]'

plz help >>>>>>

Assets/Wall/Walls.js(10,25): BCE0019: ‘Add’ is not a member of ‘UnityEngine.Transform

var wallpreba : Transform;
var myArray : Transform;

function Start () {

var go : GameObject[] = GameObject.FindGameObjectsWithTag("wall");
for (var wall : GameObject in go)
	Instantiate(wallpreba, wall.transform.position, wallpreba.transform.rotation);


Built-in arrays are not resizable and don’t have any Add functions or the like.