变量尚未分配。，Prefab在更改参考游戏对象的值后丢失了参考

Question

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;

 public class Manager : MonoBehaviour
 {
     public  GameObject displayslider;
     public  GameObject TimeGetAngle;
     public float TimeAngle, display;
     public Text displayvaluetext, TimeAngletext;
     public static Manager instance = null;
     void Awake()
     {
         if (instance == null)
             instance = this;
         else if (instance != this)
             Destroy(gameObject);
         DontDestroyOnLoad(gameObject);
         TimeAngle = 0;
         display = 5;
     }
     void Start()
     {
         displayslider = GameObject.Find("displayslider");
         Debug.LogError("", displayslider);
         TimeGetAngle = GameObject.Find("Canvas/Panel/TimeGetAngle");
         TimeAngletext = GameObject.Find("Canvas/Panel/TimeAngletext").GetComponent<Text>();
         displayvaluetext = GameObject.Find("Canvas/Panel/displayvaluetext").GetComponent<Text>();
         TimeAngletext.text = "" + TimeGetAngle.GetComponent<Slider>().value;
         displayvaluetext.text = "" + displayslider.GetComponent<Slider>().value;
     }
     public void TimeGetAngleselect()
     {
         TimeAngle = TimeGetAngle.GetComponent<Slider>().value;
         TimeAngletext.text = "" + TimeAngle;
     }
     public void Displayselect()
     {
         Debug.LogError("", displayslider);
         display = displayslider.GetComponent<Slider>().value;
         displayvaluetext.text = "" + display;
     }
 }

我在预制件中有这两个滑块，我想制作它，以便当我更改其中一个的值时，它旁边的文本框会显示该值。因此，当滑块更改值时，它会调用DisplaySelect()方法。对于预设值，它可以正常工作，但是当我更改滑块中的值时，会出现以下错误：

  

UnassignedReferenceException：尚未分配Manager的变量displayslider。您可能需要在检查器中分配Manager脚本的displayslider变量