Question I have a error that i don't know how to fix it!

I've watched a youtube video on how to make a random dungeon map generator, but when I run it the spawn is blocked and an error keeps popping out.

the error is :"NullReferenceException: Object reference not set to an instance of an object
RoomSpawner.OnTriggerEnter2D (UnityEngine.Collider2D other) (at Assets/scripts/RoomSpawner.cs:62)"

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class RoomSpawner : MonoBehaviour
6. {
7.     public int openingDirection;
8.     // 1 --> need bottom door
9.     // 2 --> need top door
10.     // 3 --> need left door
11.     // 4 --> need right door
12.  
13.     private RoomTemplates templates;
14.     private int rand;
15.     private bool spawned = false;
16.  
17.     public float waitTime = 4f;
18.  
19.     void Start()
20.     {
21.         Destroy(gameObject, waitTime);
22.         templates = GameObject.FindGameObjectWithTag("Rooms").GetComponent<RoomTemplates>();
23.         Invoke("Spawn", 0.1f);
24.     }
25.  
26.     void Spawn()
27.     {
28.         if(spawned == false)
29.         {
30.             if (openingDirection == 1)
31.             {
32.                 //Need to spawn a room with a BOTTOM door.
33.                 rand = Random.Range(0, templates.bottomRooms.Length);
34.                 Instantiate(templates.bottomRooms[rand], transform.position, templates.bottomRooms[rand].transform.rotation);
35.             }
36.             else if (openingDirection == 2)
37.             {
38.                 //Need to spawn a room with a TOP door.
39.                 rand = Random.Range(0, templates.topRooms.Length);
40.                 Instantiate(templates.topRooms[rand], transform.position, templates.topRooms[rand].transform.rotation);
41.             }
42.             else if (openingDirection == 3)
43.             {
44.                 //Need to spawn a room with a LEFT door.
45.                 rand = Random.Range(0, templates.leftRooms.Length);
46.                 Instantiate(templates.leftRooms[rand], transform.position, templates.leftRooms[rand].transform.rotation);
47.             }
48.             else if (openingDirection == 4)
49.             {
50.                 //Need to spawn a room with a RIGHT door.
51.                 rand = Random.Range(0, templates.rightRooms.Length);
52.                 Instantiate(templates.rightRooms[rand], transform.position, templates.rightRooms[rand].transform.rotation);
53.             }
54.             spawned = true;
55.         }
56.     }
57.  
58.     void OnTriggerEnter2D(Collider2D other)
59.     {
60.         if(other.CompareTag("SpawnPoint"))
61.         {
62.             if(other.GetComponent<RoomSpawner>().spawned == false && spawned == false)
63.             {
64.                 Instantiate(templates.closedRoom, transform.position, Quaternion.identity);
65.                 Destroy(gameObject);
66.             }
67.             spawned = true;
68.         }
69.     }
70. }
71.  

 

Ok, ill try that

 

I solved the problem, what i had to do is link the room spawner code to a spawn point which didn't had it.