Menu Doesn't Work

Hey! I've been playing with Unity for a while now but only started getting into building my own game about 3 days ago. I've made a tutorial level and have a trigger at the end of the level set up to take me back to the menu scene (Code attached)
but, this happens:
https://screenrec.com/share/LzlM4stdZH

If anyone could help me that would be great

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.SceneManagement;
5.  
6. public class MainMenu : MonoBehaviour
7. {
8.     private void OnTriggerEnter(Collider other)
9.     {
10.         if (other.CompareTag("Player"))
11.         {
12.             SceneManager.LoadScene(0);
13.             Cursor.lockState = CursorLockMode.None;
14.             Cursor.visible = true;
15.         }
16.     }
17. }
18.