why my script that loads a specific scene don't work?

Questions & Answers
1

I was making my level select screen for my game when the code that load the corresponded scene didn’t work. It only gives me “ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.”.

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

public class button : MonoBehaviour
{
    public int scenetoload;
    private bool touched = false;
    public void tap()
    {
        touched = true;
    }
    public void Update()
    {
        if (touched)
            SceneManager.LoadScene(scenetoload);
    }
}

Void Tap() activate with a button click, and sceneToLoad is assigned to 1, All my scenes are in Scenes in Build List ( 18 scenes at total and the level select screen is the first one ). I updated my unity (I was in Version 2019.3.8f1 to 2020.1.9f1) to see if it was a Unity Bug but this error continues. i dont know what to do anymore, what is wrong with my script?

Sorry for any Grammar errors, English is not my principal Language

2

I am not sure why you get the error, but first can you try this and comment the result of the debug.log ?

using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 public class button : MonoBehaviour
 {
     public int scenetoload;
     public void tap()
     {
             Debug.Log(scenetoload);
             SceneManager.LoadScene(scenetoload);
     }
 }