Roll A Ball Obstacle course Question

I followed a tutorial at: https://www.mvcode.co/lessons/roll-a-ball-obstacle-course

I am at course 5 and I can not get the restart button to work.

I have changed this code:

 Application.LoadLevel ("MainScene"); //obselete code!

to: SceneManager.LoadScene ("MainScene");

and in the script levelReset.cs I have changed:

using UnityEngine; using UnityEngine.EventSystems; using UnityEngine.SceneManagement;

public class LevelReset : MonoBehaviour , IPointerClickHandler {

 public void OnPointerClick (PointerEventData data) {

     // reload the scene
 //Application.LoadLevelAsync(Application.loadedLevelName);//obselete
 



     UnityEngine.SceneManagement.SceneManager.LoadScene(UnityEngine.SceneManagement.SceneManager.GetActiveScene().buildIndex);

 }

}

Any ideas? has anyone else followed this tutorial? Its a great tutorial until the end!