Assets\_Game\play\Play.cs(9,22): error CS0117: 'SceneManager' does not contain a definition for 'Load' помогите!

 using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class Play : MonoBehaviour
{
    public void PlayGame()
    {
        SceneManager.Load(SceneManager.GetActiveScene().buildIndex + 1);
    }

     public void ExitGame()
    {
        application.Quit();
    }
}