编译问题

在使用从unity资源商店下载的DarkTreeFPSv1.4
自己做了一个地图后想play一下看看,提示说"All compiler errors have to be fixed before entering playmode"
我找到了出错的脚本,但不知道哪里有问题,代码如下
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering.PostProcessing;
public class WaterVolumePostProcessing : MonoBehaviour
{
public PostProcessVolume postProcessVolume;
public PostProcessProfile standard;
public PostProcessProfile water;
void Start()
{
}
void Update()
{
}
}