C# nullreferenceexception object reference not set

Questions & Answers
1

In my game the player starts in a town, I want the monster to spawn when you leave the town. So I have created a cube with no renderer and made it a Box Cillder that IS a trigger. I have written this code and applied it to the cube.

using UnityEngine;
using System.Collections;

public class NightStalker_active : MonoBehaviour 
{
	public Vector3 spawnPosition = new Vector3(-2406, -18, 51);

	void OnTriggerEnter(Collider other) 
	{
		if(other.gameObject.tag == "Player")
		{
			Debug.Log("NightStalker_active_TOUCH: ");
			//GameObject.FindGameObjectWithTag("NightStalker").SetActive(true);
			GameObject.FindGameObjectWithTag("NightStalker").transform.position = spawnPosition;
		}
		
	}
}

I have tried to set the monster (NightStalker) to active and just letting it say active but move it to a new position (Hiding it somewhere in a box). I cant see to get this to work. I can get objects set active false with trigger volumes, I use one to turn off the rain when you walk into a building but cannot switch it back on.

Please, How can I get my object or something tagged to be setactived or its tranform moved?

2

Your error says that
GameObject.FindGameObjectWithTag("NightStalker") is not returning anything, but you’re trying to use it. Make sure that you have an object that is tagged “NightStalker”.

GameObject nightStalker = GameObject.FindGameObjectWithTag("NightStalker");
if(nightStalker==null){
     Debug.Log("no night stalker found");
}