Help please.

in Unity 2018.2.20f1:
I am making a top down shooter(2d) and have a enemy class for all enemy AI to derive from. Pretty simple.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class AI : MonoBehaviour {
6.  
7.     public int health;
8.     public float speed;
9.  
10.     public float timeTweenAttack;
11.    
12.     [HideInInspector]
13.     public Transform player;
14.  
15.     public int damage;
16.  
17.     // Use this for initialization
18.     void Start () {
19.  
20.         player = GameObject.FindGameObjectWithTag("Player").transform;
21.     }
22.    
23.     // Update is called once per frame
24.     void Update () {
25.        
26.     }
27.  
28.     public void takedamage(int damageAmount)
29.     {
30.         health -= damageAmount;
31.         if (health <= 0)
32.         {
33.             Destroy(this.gameObject);
34.         }
35.     }
36. }

And yet, player = GameObject.FindGameObjectWithTag("Player").transform; throws up a Object not set to an instance of an object. Error. The player is a prefab, if that matters.

What do I do?

 

Where do you define GameObject?

 

You don't have a GameObject tagged with "Player" active in the scene at the time this Start method is called. If you are later instantiating this object, wait until it exists before you try to grab a reference to it. Or better yet, just cache the reference Instantiate returns in the first place.

 

You'd know better than us

https://docs.unity3d.com/ScriptReference/GameObject.html

 

I have a Player tagged as player at the start of the scene. It exists when the enemy is instantiated

 

Please show the code where it is instantiated. It's not in scope in this script.