Passing information error

I have an array (board) with values on one script. I've finally managed to get it talking to the other script, yet now I'm getting an error

NullReferenceException: Object reference not set to an instance of an object Token.Update () (at Assets/Scripts/Token.cs:20)

in Token (I really wish I could rename that) I have this

void Update () { boardValue=spot.Locator(x,y); if (boardValue==1) { transform.localRotation = new Quaternion(0,180,0,0); } else { transform.localRotation = new Quaternion(0,0,0,0); } }

It seems to be passing information but I'm not positive what that message means enough that I could correct the issue. Any ideas?