Question Call a script from a prefab to update the score

Hi everyone,
I'm very new to unity (just about to finish the junior dev. learning) and I'm struggling with one task.

So basically, I have a box, when my targets collide with it, it counts points (from -3 to 1). Targets are 3 prefabs and they spawn via a spawn manager.

I've set point value in my Target script.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using static UnityEditor.PlayerSettings;
5. using TMPro;
6. using UnityEngine.UI;
7.  
8.  
9. public class Target : MonoBehaviour
10. {
11.     public Rigidbody targetRb;
12.     public float AngularSpeed;
13.     public float Speed;
14.  
15.     private float poS = 0.2f;
16.  
17.     public AudioSource collectSound;
18.  
19.  
20.     //score
21.     public int pointValue;
22.  
23.  
24.  
25.     // Start is called before the first frame update
26.     void Start()
27.     {
28.         targetRb = GetComponent<Rigidbody>();
29.     }
30.  
31.     // Update is called once per frame
32.     void Update()
33.     {
34.  
35.     }
36.  
37.     // Add Force to targets
38.     private void FixedUpdate()
39.     {
40.         Speed = targetRb.velocity.magnitude;
41.         AngularSpeed = targetRb.angularVelocity.magnitude;
42.  
43.         if(transform.position.x > poS)
44.         {
45.             targetRb.AddForce(Vector3.left,ForceMode.Impulse);
46.  
47.         }
48.  
49.         if(transform.position.x < poS)
50.         {
51.             targetRb.AddForce(Vector3.right,ForceMode.Impulse);
52.  
53.         }
54.     }
55.  
56.     // Destroy the objects
57.     private void OnMouseDown()
58.     {
59.         Destroy(gameObject);
60.  
61.     }
62.  
63.  
64.  
65.  
66.  
67.  
68. }
69.  

I attached a script to my box a Counter in order to count points and call the Target script and its point value. But it doesn't work

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using TMPro;
5. using UnityEngine.UI;
6.  
7. public class CounterScore : MonoBehaviour
8.  
9. {
10.     private int score;
11.     public TextMeshProUGUI scoreText;
12.  
13.     //link to target script
14.     public GameObject prefab;
15.     public Target targetScript;
16.  
17.  
18.     // Start is called before the first frame update
19.     void Start()
20.     {
21.         score = 0;
22.         targetScript = GameObject.Find("Target2").GetComponent<Target>();
23.  
24.     }
25.  
26.     // Update is called once per frame
27.     void Update()
28.     {
29.  
30.     }
31.  
32.  
33.     //Update score
34.     private void OnCollisionEnter(Collision collision)
35.     {
36.         UpdateScore(targetScript.pointValue);
37.     }
38.      
39.  
40.  
41.     private void UpdateScore(int scoreToAdd)
42.     {
43.         score += scoreToAdd;
44.  
45.         scoreText.text = "Points:" + score;
46.     }
47.  
48.  
49.  
50.  
51.  
52. }
53.  

The error is "NullReferenceException: Object reference not set to an instance of an object
CounterScore.OnCollisionEnter (UnityEngine.Collision collision) (at Assets/Script/CounterScore.cs:34)".

What should I do?

 

There's only one thing to do. The answer is ALWAYS the same... ALWAYS!!

How to fix a NullReferenceException error

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

Three steps to success:
- Identify what is null <-- any other action taken before this step is WASTED TIME
- Identify why it is null
- Fix that