the object of type rigidbody has been destroyed

Hi, I checked other threads but could not find an answer. I get this error when I load the same scene like with try again button. error shows 2 scripts that has the possible erron but I cant figure it out please help

Code (CSharp):

1. public class movement : MonoBehaviour
2. {
3.     Rigidbody rigid;
4.     private float zOffset = 20;
5.  
6.     private void Start()
7.     {
8.         rigid = GetComponent<Rigidbody>();
9.         SwipeDetector.OnSwipe += SwipeDetector_OnSwipe;
10.     }
11.  
12.     private void SwipeDetector_OnSwipe(SwipeData data)
13.     {
14.         Vector3[] positions = new Vector3[2];
15.         positions[0] = Camera.main.ScreenToWorldPoint(new Vector3(data.StartPosition.x, 0, data.StartPosition.y));
16.         positions[1] = Camera.main.ScreenToWorldPoint(new Vector3(data.EndPosition.x, 0, data.EndPosition.y));
17.         Vector3 throwdir = (positions[1] - positions[0]).normalized;
18.         throwdir.y = 0;
19.             rigid.AddForce(-throwdir*750f,ForceMode.Acceleration); //error line
20.      
21.     }
22. }

and this

Code (CSharp):

1. public class SwipeDetector : MonoBehaviour
2. {
3.     private Vector2 fingerDownPosition;
4.     private Vector2 fingerUpPosition;
5.  
6.     [SerializeField]
7.     private bool detectSwipeOnlyAfterRelease = false;
8.  
9.     [SerializeField]
10.     private float minDistanceForSwipe = 20f;
11.  
12.     public static event Action<SwipeData> OnSwipe = delegate { };
13.  
14.     private void Update()
15.     {
16.         foreach (Touch touch in Input.touches)
17.         {
18.             if (touch.phase == TouchPhase.Began)
19.             {
20.                 fingerUpPosition = touch.position;
21.                 fingerDownPosition = touch.position;
22.             }
23.  
24.             if (!detectSwipeOnlyAfterRelease && touch.phase == TouchPhase.Moved)
25.             {
26.                 fingerDownPosition = touch.position;
27.                 DetectSwipe();
28.             }
29.  
30.             if (touch.phase == TouchPhase.Ended)
31.             {
32.                 fingerDownPosition = touch.position;
33.                
34.                 DetectSwipe();
35.             }
36.         }
37.     }
38.  
39.     private void DetectSwipe()
40.     {
41.         if (SwipeDistanceCheckMet())
42.         {
43.             if (IsVerticalSwipe())
44.             {
45.                 var direction = fingerDownPosition.y - fingerUpPosition.y > 0 ? SwipeDirection.Up : SwipeDirection.Down;
46.                 SendSwipe(direction);
47.             }
48.             else
49.             {
50.                 var direction = fingerDownPosition.x - fingerUpPosition.x > 0 ? SwipeDirection.Right : SwipeDirection.Left;
51.                 SendSwipe(direction);
52.             }
53.             fingerUpPosition = fingerDownPosition;
54.         }
55.     }
56.  
57.     private bool IsVerticalSwipe()
58.     {
59.         return VerticalMovementDistance() > HorizontalMovementDistance();
60.     }
61.  
62.     private bool SwipeDistanceCheckMet()
63.     {
64.         return VerticalMovementDistance() > minDistanceForSwipe || HorizontalMovementDistance() > minDistanceForSwipe;
65.     }
66.  
67.     private float VerticalMovementDistance()
68.     {
69.         return Mathf.Abs(fingerDownPosition.y - fingerUpPosition.y);
70.     }
71.  
72.     private float HorizontalMovementDistance()
73.     {
74.         return Mathf.Abs(fingerDownPosition.x - fingerUpPosition.x);
75.     }
76.  
77.     private void SendSwipe(SwipeDirection direction)
78.     {
79.         SwipeData swipeData = new SwipeData()
80.         {
81.             Direction = direction,
82.             StartPosition = fingerDownPosition,
83.             EndPosition = fingerUpPosition
84.         };
85.         OnSwipe(swipeData);
86.     }
87. }
88.  
89. public struct SwipeData
90. {
91.     public Vector2 StartPosition;
92.     public Vector2 EndPosition;
93.     public SwipeDirection Direction;
94. }
95.  
96. public enum SwipeDirection
97. {
98.     Up,
99.     Down,
100.     Left,
101.     Right
102. }

 

We would need to see the error is giving you to better understand. As far as i can see, this code shouldnt throw that error.

 

What's happening is that with this line:

Code (csharp):

1. SwipeDetector.OnSwipe += SwipDetector_OnSwipe;

You're setting up SwipeDetector to call a method on object X. Then when you reload the scene, object X is destroyed, and identical object Y replaces it, but SwipeDetector is still trying to call the method on object X.

A common practice to avoid this is to make sure the script cleans up after itself by using OnEnable/OnDisable instead.

Code (csharp):

1. void OnEnable() {
2. SwipeDetector.OnSwipe += SwipDetector_OnSwipe;
3. }
4. void OnDisable() {
5. SwipeDetector.OnSwipe -= SwipDetector_OnSwipe;
6. }

 

saved my day, thanks a lot for explaination. respect