Really frustrating issue.

Hello guys, I'm sorry that I'm posting so many issues, but I would like someone to have a look on that script and tell me what's wrong with it.

This is the error

NullReferenceException: Object reference not set to an instance of an object
BulletHurtingMonster.OnTriggerEnter2D (UnityEngine.Collider2D other) (at Assets/BulletHurtingMonster.cs:25)


and this is the code, and I'll link the code of the MonsterHealth below it.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class BulletHurtingMonster : MonoBehaviour {
5.  
6.     public GameObject anotherbullet;
7.  
8.  
9.  
10.     void Start ()
11.     {
12.    
13.     }
14.    
15.     void Update ()
16.     {
17.    
18.     }
19.  
20.     void OnTriggerEnter2D (Collider2D other)
21.     {
22.     if (other.tag == "Monster")
23.         {
24.             Instantiate(anotherbullet, transform.position,transform.rotation);
25.             other.GetComponent<MonsterHealthManager> ().DamageMonster(1);
26.             Destroy (gameObject);
27.        
28.         }
29.     }
30. }
31.  

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.UI;
4.  
5. public class MonsterHealthManager : MonoBehaviour {
6.    
7.     public int minMonsterHealth;
8.     public int maxPMonsterHealth;
9.     public int curMonsterHealth;
10.  
11.     public Slider healthbar;
12.  
13.     public GameObject monsterexplosion;
14.    
15.     public int pointsOnDeath;
16.  
17.  
18.    
19.    
20.    
21.     void Start ()
22.     {
23.         curMonsterHealth = maxPMonsterHealth;
24.     }
25.    
26.     void Update ()
27.     {
28.         healthbar.value = curMonsterHealth;
29.        
30.         if (curMonsterHealth <= 0)
31.         {
32.             Instantiate(monsterexplosion, transform.position, transform.rotation);
33.             ScoreManager.AddPoints (pointsOnDeath);
34.             Destroy(gameObject);
35.         }
36.     }
37.  
38.     public void DamageMonster (int damagetogivemonster)
39.     {
40.         curMonsterHealth -= damagetogivemonster;
41.     }
42.  
43. }
44.  

 

The bullet is hitting something that has a tag of "Monster" and yet doesn't have a MonsterHealthManager component.

 

That fixed it! thank you so much!!!