Object reference not set to an instance of an object

I dont understand what is causing the issue. https://imgur.com/a/jUkfg3C using System; using System.Collections; using System.Collections.Generic; using System.Runtime.CompilerServices; using UnityEngine; using UnityEngine.SceneManagement;

 public class DogFov : MonoBehaviour
 {
     public float fovAngle = 90f;
     public Transform fovPoint;
     public float range = 8;
     public Transform target;
     bool hasSeen;
     bool move;
     [SerializeField] GameObject light;
     [SerializeField] float dogSpeed;
 
     void Update()
     {
         if(!hasSeen)
         {
             Vector2 dir = target.position - transform.position;
             float angle = Vector3.Angle(dir, fovPoint.up);
             RaycastHit2D r = Physics2D.Raycast(fovPoint.position, dir, range);
             if (angle < fovAngle / 2)
             {
                 if (r.collider.CompareTag("Player"))
                 {
                     Debug.DrawRay(fovPoint.position, dir, Color.red);
                     light.active = false;
                     hasSeen = true;
                     move= true;
                 }
             }
         }
         if(move)
         {
             t$$anonymous$$s.transform.position = Vector2.MoveTowards(transform.position, target.transform.position, dogSpeed);
             if (transform.position == target.transform.position)
             {
                 Invoke(nameof(RestartScene), 0.5f);
             }
         }
     }
 
     private void RestartScene()
     {
         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
     }
 }