出现错误

Assets\Standard Assets\Utility\ForcedReset.cs(6,27): error CS0619: ‘GUITexture’ is obsolete: ‘GUITexture has been removed. Use UI.Image instead.’
还有一条，忘记记录了，大概是
Assets\Standard Assets\Utility\SimpleActivatorMenu 也发生的这个错误，同样是GUITexture；

错误症状

1. unity 底部出现2个错误
2. 脚本挂载不上物体，出现下图错误：
   

解决办法

转载自此链接

第一步，修改SimpleActivatorMenu脚本

using System;
using UnityEngine;
using UnityEngine.UI; //在此处添加

namespace UnityStandardAssets.Utility
{
    public class SimpleActivatorMenu : MonoBehaviour
    {
        // An incredibly simple menu which, when given references
        // to gameobjects in the scene
        public Text camSwitchButton; //在此处修改
        public GameObject[] objects;
......

第二步，修改ForcedReset脚本

using System;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityStandardAssets.CrossPlatformInput;
using UnityEngine.UI; //在此处添加

[RequireComponent(typeof (Image))] //在此处修改
public class ForcedReset : MonoBehaviour
{
    private void Update()
    {
        // if we have forced a reset ...
        if (CrossPlatformInputManager.GetButtonDown("ResetObject"))
        {
            //... reload the scene
            SceneManager.LoadScene(SceneManager.GetSceneAt(0).name);
        }
    }
}

问题解决！