Assets\Scenes\Play.cs(15,1): error CS0103: The name 'SeneManager' does not exist in the current context выдаёт ошибку!

 using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class GameButton : MonoBehaviour
{
 public void LoadNextScene()
 {
 int currentSceneIndex = SceneManager.GetActiveScene().buildIndex;
 SceneManager.LoadScene(currentSceneIndex + 1);
 }

public void LoadStartScene(){

SeneManager.LoadScene(0);

}

}