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ERROR - Null reference exception : Object reference not set to an instance of an object

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Im making pong game, i want to send true or false depending on the wall the ball struck. the score gets updated the right way but i keep getting this error units says the error is in the **score** script in the first line of **void funtion** void Update() { scoreR.text = pR.ToString(); scoreL.text = pL.ToString(); } here is my **ball movement code** public class BallMovement : MonoBehaviour { public float speed = 30f; Rigidbody2D rb; int p; void Start() { rb = GetComponent(); rb.velocity = Vector2.right * speed; } float hitFactor(Vector2 ballPos, Vector2 racketPos, float racketHeight) { return (ballPos.y - racketPos.y) / racketHeight; } void OnCollisionEnter2D(Collision2D col) { if (col.gameObject.name == "LeftRacket") { float y = hitFactor(transform.position, `col.transform.position, col.collider.bounds.size.y); Vector2 dir = new Vector2(1, y).normalized; rb.velocity = dir * speed; } if (col.gameObject.name == "RightRacket") { float y = hitFactor(transform.position, col.transform.position, col.collider.bounds.size.y); Vector2 dir = new Vector2(-1, y).normalized; rb.velocity = dir * speed; } if (col.gameObject.CompareTag("Wall")) { if (col.gameObject.name == "LeftWall") { Score.instance.score(true); } else if (col.gameObject.name == "RightWall") { Score.instance.score(false); } } } } and my **score script** public class Score : MonoBehaviour { public static Score instance; public TextMeshProUGUI scoreR; public TextMeshProUGUI scoreL; int pR = 0; int pL = 0; // Start is called before the first frame update void Start() { instance = this; } // Update is called once per frame void Update() { scoreR.text = pR.ToString(); scoreL.text = pL.ToString(); } public void score(bool racket) { if (racket == true) { pR += 1; } else if (racket == false) { pL += 1; } } } Also is there any other way to send the bool from ball movement script to my score script without instance or is this the best way?

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