Change gameonbject sprite render with button

Unity Engine
1

Hi. Iam working on system, where button can change sprite render object. So i maked 2 scripts, first-

    #pragma strict
    publicvar sprajt:Sprite;
    functionUpdate(){
    GetComponent(SpriteRenderer).sprite = sprajt;
    }

This script is in gameobject. Second-

    #pragma strict
    publicvar sprajtTWO :Sprite;
    function change (){
    GetComponent(objectSCRIPT).sprajt = sprajtTWO;
    }

that is in button fucntion OnClick… i want when someone pressbutton sprite render will change… so there is problem, error “Object reference not set to an instance of an object”… any solution / ideas how to make sprite render changer?

2

Are you assigning sprajt and sparjtTWO