Calling a variable from another script at an instance.

I am trying to import a variable form another script at the instance it is called.

 function Update () {
     characterMovement = GetComponent(CharacterMotor).currentMovementOffset;
 //     transform.position = new Vector3(objectFollow.transform.position.x,objectFollow.transform.position.y + yOffset,objectFollow.transform.position.z + zOffset);
     MoveX();
 }
 function MoveX() {
     if (Mathf.Abs(objectFollow.transform.position.x - transform.position.x) >=  maxBufferX)
         transform.position.x += characterMovement.x;
     if (Mathf.Abs(objectFollow.transform.position.x - transform.position.x) >=  maxBufferX + .5)
         transform.position.x += .5;
 }

this is the error im getting too: NullReferenceException: Object reference not set to an instance of an object