Can't GameObject.FindWithTag of instantiated gameobject

So I have a script set up so that if a tagged prefab gets within a certain distance of another certain gameobject it renders the object yellow/green. It works fine for objects already created before runtime but during runtime it won’t interact with the cloned/instantiated gameobject.

If anyone can help figure this out i would greatly appreciate it. I have some idea’s and i tried acouple but I’m still pretty new to all this.

Here’s the code: This works for un-instantiated gameobjects. Cloned objects give errors/null references. Perhaps if i set the instantiated prefab in the script = something and reference it i could get something to work. I’m still learning the syntax.

var Distance;
var useDistance = 2.0;
var target : Transform;


function Start () {
target = GameObject.FindWithTag("Player").transform;
}

function Update () 
{
	useDistance = Vector3.Distance(target.position, transform.position);
	
	if (Distance < useDistance)
	{
		renderer.material.color = Color.yellow;
	}
	
	
	if (Distance > useDistance)
	{
		renderer.material.color = Color.green;
	}

I would suggest instead of using Find, you use OnTriggerEnter and OnTriggerExit which picks up only objects tagged with “Player”.
Sorry though, I’m a C# person.

using UnityEngine;
using System.Collections;

public class EnemySight : MonoBehaviour {

	public float WaitUntilReset = 0;
	public string TagToNotice = "Player";

	public bool NoticeTag = true;

    void OnTriggerEnter(Collider other) {
	if (other.gameObject.tag == TagToNotice) {
	    renderer.material.color = Color.yellow;
        }
    }

    void OnTriggerExit(Collider other) {
	    if (NoticeTag) {
	        if (other.gameObject.tag == TagToNotice) {
	            renderer.material.color = Color.green;
	    }
        }
    }
}

It made a clone of it when you do that, you need to

if(col.name == "Player(Clone)")

So if it was a normal player it would be named just Player. This is just an example, this is why it returned null because its not the original , its a clone so have it look for the clone of it, also the user above me works as well. If you need it in Java script let me know, I work with both of them.

Thanks for the replys/solutions! I’ll make sure to try both out for learning in the morning. I’m spent after getting a different script to finally work.

(p.s. I’m a js guy but I should be able to convert it over =)