Необычная ошибка UnassignedReferenceException

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class ObjectSpawner : MonoBehaviour {
 
    public bool isSameDelay;
    public bool isRandomObject;
    public GameObject ObjectToSpawn;
    public GameObject[] ObjectsToSpawn;
    public float timeBeforeSpawn;
    public float spawnDelay;
    public float minDelay;
    public float maxDelay;
 
    private void Start () {
        if(isSameDelay)
        {
            InvokeRepeating("Spawn", timeBeforeSpawn, spawnDelay);
        }
        else
        {
            StartCoroutine(Spawner());
        }
    }
 
    private IEnumerator Spawner()
    {
        yield return new WaitForSeconds(Random.Range(minDelay, maxDelay));
        Spawn();
    }
 
    private void Spawn()
    {
        if(!isRandomObject)
        {
            GameObject obj = Instantiate(ObjectToSpawn, transform.position, transform.rotation) as GameObject;
        }
 
        if (isRandomObject)
        {
            GameObject obj = Instantiate(ObjectsToSpawn[Random.Range(0, ObjectsToSpawn.Length)], transform.position, transform.rotation) as GameObject;
        }
 
        if(isSameDelay)
        {
            StartCoroutine(Spawner());
        }
    }
}

ObjectToSpawn = GameObject.FindGameObjectsWithTag("objSpawn");

            GameObject obj = Instantiate(ObjectToSpawn, transform.position, transform.rotation) as GameObject;