Error CS1061 I can't find a solution! [C#]

Hi, I'm new to unity and i got my script but it's not working and i can't find the reason can someone help me?

This is my script: C#

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class GameEnd : MonoBehaviour {
     public GameObject CanvasIG;
     public GameObject CanvasEnd;
     // Use this for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
         
     }
     void OnTriggerEnter(Collider EndPad)
     {
 
         if (EndPad.gameObject.tag == "Player") {
 
             CanvasIG.GameObject.SetActive (false);
             CanvasEnd.GameObject.SetActive (true);
 
         } else {
 
 
         }
     }
 }

That code should make a canvas appear and anotherone disappear when the player is colliding with an object. Thank you in advanced.