OnLevelWasLoaded was not called

OnLevelWasLoaded Problem using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour { public static GameManager instance;

  [HideInInspector]
  public bool gameStartedFromMainMenu, gameRestartedAfterPlayerDied;
 
  [HideInInspector]
  public int Score, coinScore, lifeScore;
 
  void Awake()
  {
      MakeSingleton();
  }
 
  void OnLevelWasLoaded()
  {
 
      Debug.Log("on Level Loaded");
      if (SceneManager.GetActiveScene().name == "Gameplay")
      {
          if (gameRestartedAfterPlayerDied)
          {
 
              GamePlayController.instance.SetScore(Score);
              GamePlayController.instance.SetCoinScore(coinScore);
              GamePlayController.instance.SetLifeScore(lifeScore);
 
              PlayerScoreScript.scoreCount = Score;
              PlayerScoreScript.coinCount = coinScore;
              PlayerScoreScript.lifeCount = lifeScore;
 
          }
          else if (gameStartedFromMainMenu)
          {
              PlayerScoreScript.scoreCount = 0;
              PlayerScoreScript.coinCount = 0;
              PlayerScoreScript.lifeCount = 2;
 
              GamePlayController.instance.SetScore(0);
              GamePlayController.instance.SetCoinScore(0);
              GamePlayController.instance.SetLifeScore(2);
          }
      }
  }