IndexOutOfRangeException: Array index is out of range.

I copied a script and its not working, please help me.

 using System.Collections;
 using UnityEngine;
 
 
 
 public class Spawner : MonoBehaviour
 {
 
     public GameObject[] enemies;
     public Vector3 spawnValues;
     public float spawnWait;
     public float spawnMostWait;
     public float spawnLeastWait;
     public int startWait;
     public bool stop;
 
     int randEnemy;
 
 
 
     void Start()
     {
         StartCoroutine(waitSpawner());
     }
 
 
     void Update()
     {
         spawnWait = Random.Range(spawnLeastWait, spawnMostWait);
     }
 
     IEnumerator waitSpawner()
     {
         yield return new WaitForSeconds(startWait);
 
         while (!stop)
         {
             randEnemy = Random.Range(0, 2);
 
             Vector3 spawnPosition = new Vector3(Random.Range(-spawnValues.x, spawnValues.x), 1, Random.Range(-spawnValues.z, spawnValues.z));
 
             Instantiate(enemies[randEnemy], spawnPosition + transform.TransformPoint(0, 0, 0), gameObject.transform.rotation);
 
             yield return new WaitForSeconds(spawnWait);
         }
 
     }
 
 }

The error message: