Ошибка в скрипте, Unity ADS, как настроить?

using UnityEngine;
using UnityEngine.Advertisements;
using System.Collections;

public class GameState : Singleton<GameState> {

	public bool startGame = false;
	public bool endGame = false;
	private Bird player;
	public BackgroundGame[] background;

	private CoinsManager coins;

	private static int advCount = 0;

	public GameObject uiEnd;
	public GameObject uiStart;
	public GameObject uiScore;
	public GameObject uiHightCoins;
	public bool deleteSave = false;

	public AudioSource music;

	void Start () {
		if (PlayerPrefs.GetString ("NoAds") != "yes") {
			if (Advertisement.isSupported) {
				Advertisement.Initialize ("1667763", false);
			}	else
				Debug.Log ("Platform is not supported");
			if (deleteSave)
				PlayerPrefs.DeleteAll ();

			player = FindObjectOfType<Bird> ();
			coins = FindObjectOfType<CoinsManager> ();

			uiEnd.SetActive(false);
			uiStart.SetActive (true);
			uiScore.SetActive (true);

			startGame = false;
			endGame = false;
			music.Stop ();}
		     }

		void Update () {
			if(PlayerPrefs.GetString ("NoAds") != "yes") {
				advCount++;
				if (Advertisement.IsReady ()&& advCount %5 == 0)
					Advertisement.Show();
				for (int i = 0; i < background.Length; i++) {
					if(!startGame)
					{
						background[i].enabled = false;
					}else{
						background[i].enabled = true;
					}
				}

				if(player.isDead)
				{
					endGame = true;
					startGame = false;
					music.Stop();
				}

				if(endGame)
				{
					if(coins.Coin > coins.MaxCoins)
					{
						coins.MaxCoins = coins.Coin;
						PlayerPrefs.SetInt("Coins", coins.MaxCoins);
						coins.MaxCoins = PlayerPrefs.GetInt("Coins");
						coins.UpdateHightCoins("<color=yellow>New </color>",coins.MaxCoins);
					}

					if(Input.GetMouseButtonDown(0))
						Application.LoadLevel(Application.loadedLevel + 0);

					uiEnd.SetActive(true);
					uiScore.SetActive(false);

				}

				if(!endGame)

					if (Input.GetMouseButtonDown (0) && !startGame)
					{
						startGame = true;
						endGame = false;
						music.Play();

						uiStart.SetActive (false);
					}
				}

           }

}