我一直在嘗試通過創建一個簡單的跑步游戲來學習 Unity 3D。游戲從資產商店衍生出一條簡單的道路。我決定在這條路上添加一些障礙物并從中制作一個預制件，但是當我將該預制件添加到一個數組中時，Unity 從中獲取預制件來實例化它們并運行游戲，沒有預制件被實例化。這是我的代碼：using System.Collections;using System.Collections.Generic;using UnityEngine;public class TileManager : MonoBehaviour{public GameObject[] amountOfPrefabs;private Transform playerTransform;private float spawnZ = 0.0f;private float tileLength = 30.0f;private int amnTileOnScreen = 7;// Use this for initializationvoid Start(){    playerTransform = GameObject.FindGameObjectWithTag("Player").transform;    for (int i = 0; i < amnTileOnScreen; i++)    {        SpawnTile();    }}// Update is called once per framevoid Update(){    if (playerTransform.position.z > (spawnZ - amnTileOnScreen * tileLength))    {        SpawnTile();    }}private void SpawnTile(int prefabIndex = -1){    GameObject go;    go = Instantiate(amountOfPrefabs[0]) as GameObject;    go.transform.SetParent(transform);    go.transform.position = Vector3.forward * spawnZ;    spawnZ += tileLength;}}請幫我。