Nullrefrenceexception: рефрен объекта не установлен на страхование

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У меня есть проблема в моем враге ферабе, и я хочу решить ее, потому что я пробовал все до сих пор..

Это и есть коды:
1 - анимация врага:

using System.Collections;
using UnityEngine;

public class EnemyAnimation : MonoBehaviour {
      Animation _animation; 
    // Use this for initialization
    void Start () {
        _animation = GetComponentInChildren<animation> ();
        string animationToPlay = "";
        switch (Random.Range (0, 3)) {
        default:
        case 0:
            animationToPlay = "Move1";
            break;
        case 1:
            animationToPlay = "Move2";
            break;
        case 2:
            animationToPlay = "Move3";
            break;
        }

        _animation [animationToPlay].wrapMode = WrapMode.Loop;
        _animation.Play(animationToPlay);
        _animation [animationToPlay].normalizedTime = Random.value;
    }
}

Проблема в строке 23:
_animation [animationToPlay].wrapMode = WrapMode.Петля;

второй вариант:

using System.Collections;
using UnityEngine;

public class CombatGui : MonoBehaviour {
    Health _playerHealth;
    PlayerStats _playerStats; 
    [SerializeField]
    Texture2D _gameOverImage; 
    [SerializeField]
    Texture2D _winImage;
    // Use this for initialization
    void Start () {
        GameObject playerGameObject = GameObject.FindGameObjectWithTag ("Player");
        _playerHealth= playerGameObject.GetComponent<health>();
        _playerStats = playerGameObject.GetComponent<playerstats>();
    }
    
    // Update is called once per frame
    void OnGUI () {
        if (_playerHealth.IsDead) {
            float x = (Screen.width- _gameOverImage.width)/2;
            float y = (Screen.height-_gameOverImage.height)/2;
            GUI.DrawTexture (new Rect (x, y, _gameOverImage.width, _gameOverImage.height), _gameOverImage);
            GUI.Label (new Rect (x + 100, y + 280, 100, 100), "Zombies Killed:" + _playerStats.ZombiesKilled);
        } 
        else  if (gameManager.HasPlayerWon){
            float x = (Screen.width - _winImage.width)/2;
            float y = (Screen.height - _winImage.height)/2;
            GUI.DrawTexture (new Rect (x, y, _winImage.width, _winImage.height),_winImage);
            GUI.Label (new Rect (x + 100, y + 280, 100, 100), "Zombies Killed:" + _playerStats.ZombiesKilled);
        }
    }
}

Проблема в том, что:
если (_playerHealth.IsDead) {

Что я уже пробовал:

Я делаю все с самого начала вместе с toturials

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