NullReferenceException: Object not set to an instance of an object

I am trying to create a tower defense game but I'm having a problem (as you probably expected)

I don't know a lot about scripting and coding, I watch YouTube videos to learn how to do certain things, and I'm following one right now for the path system of the enemy. I can't find what the problem is, so I'm turning to you guys to show me the way.

Line 22 is where the error is.

The full code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Enemy : MonoBehaviour {
6.  
7.     GameObject pathGO;
8.  
9.     Transform targetPathNode;
10.     int pathNodeIndex = 0;
11.  
12.     public float EnemySpeed = 0f;
13.     public int EnemyHealth = 1;
14.  
15.     // Use this for initialization
16.     void Start () {
17.         pathGO = GameObject.Find("Path");
18.     }
19.  
20.     void GetNextPathNode()
21.     {
22.         targetPathNode = pathGO.transform.GetChild(pathNodeIndex);
23.         pathNodeIndex++;
24.     }
25.    
26.     // Update is called once per frame
27.     void Update () {
28.  
29.         if (targetPathNode == null) //If it's not already going towards a node, it sure is now
30.         {
31.             GetNextPathNode();
32.  
33.             if(targetPathNode == null) //If it goes null again, that means that it made it through the course and must be ELIMINATED
34.             {
35.                 ReachedGoal();
36.             }
37.         }
38.  
39.         Vector3 dir = targetPathNode.position - this.transform.localPosition;
40.  
41.         float distOfFrame = EnemySpeed * Time.deltaTime;
42.  
43.         if(dir.magnitude <= distOfFrame)
44.         {
45.             //Here we check if an enemy is at a node or something idk
46.             targetPathNode = null;
47.         }
48.  
49.         else
50.         {
51.             //If it isn't, then just F***ing go there idiot enemy
52.             transform.Translate(dir.normalized * distOfFrame, Space.World);
53.             Quaternion targetRotation = Quaternion.LookRotation(dir);
54.             this.transform.rotation = Quaternion.Lerp(this.transform.rotation, targetRotation, Time.deltaTime * 5);
55.         }
56.  
57.     }
58.  
59.     void ReachedGoal()
60.     {
61.         Destroy(gameObject);
62.     }
63.  
64. }

 

Does it find the object on start?
Add a Debug.Log and see.

 

It just says " The type name 'Log' does not exist in the type 'Debug' "

 

It's basically saying it either can't find the Path gameobjext or a gameobjext doesn't exist as a child of Path.

In the scene hierarchy do you have a game object called Path ? With a capital p?
Does the Path object have a child under it that has a transform component on it?

 

How did you write it?

 

Debug.Log;
Was that wrong?

 

This is my hierarchy

 

Code (CSharp):

1.     void Start () {
2.         pathGO = GameObject.Find("Path");
3. //Debug.Log("Put your string here");
4. if(pathGO == null){
5. Debug.Log("pathGO not found!");
6. } else{
7. Debug.Log("pathGO" found!");
8. }
9.    }
10.  

 

You don't have an object named "path" it's not gonna find nothing.

 

Okay so I changed the "path" to PathNode and now that error doesn't show up anymore, but now I get another error saying "UnityException: Transform child out of bounds", and it's highlighting the same line.

I googled it and apparently it has to do with my script not checking if the pathnode has any children or something like that. Do you know how to fix that?

 

You're trying to find the 'pathNodeIndex' child of PathNode, it doesn't have any - thus the null ref.

why not just make an array of game objects/ transforms and have them there instead of doing the all the find stuff?

 

Thanks for the help and the tip! I'll look into it