im using the arrayprefs script from http://www.unifycommunity.com/wiki/index.php?title=ArrayPrefs.

Im trying to save the positions of instantiated cubes. I add each cube to an array when instantiated and give the cube a unique name so i can save the Vector3 of each cube. Here is my script.

static var cubes = new Array();
var cubeCount = 0;
function Update()
{
if (Input.GetMouseButtonDown(0))
            {


            var go = Instantiate(cube2, transform.position, Quaternion.identity) as GameObject;
            go.name = "cube"+cubeCount;
            cubes.Add("cube"+cubeCount);
            cubeCount++;
            }   

if(Input.GetKey("m"))
            {
            saveGame();
            Debug.Log("saved");
            }

}

function saveGame()
    {


        for (i=0 ; i < cubes.length - 1 ; i++)
        {

        curName = cubes[i];
        PlayerPrefsX.SetVector3( curName, curName.transform.position);
        }

Im getting a NullReferenceException: Object reference not set to an instance of an object on the (PlayerPrefsX.SetVector3( curName, curName.transform.position);) line.The array is working and naming itself correctly but i keep getting that error. is my logic wrong? is there an easier way to do this?