My Script doesn't work...Survival Shooter tutorial!!

hello everyone...

Please help me..

I am following the Survival shooter tutorial interestingly..But my scripts for PlayerHealth and EnemyAttak are not working ..I just attached the scripts provided by unity each PlayerHealth to Player and EnemyAttack Script to Zombunny..and done accordingly to tutorial..

But when the Enemy attacks the player my HealthSlider is not working even I can not see Flash when the enemy attacks player..#Player Health ,Survival Shooter..

PLease help me ,

These are my scripts..

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

public class PlayerHealth : MonoBehaviour { public int startingHealth = 100; public int currentHealth; public Slider healthSlider; public Image damageImage; public AudioClip deathClip; public float flashSpeed = 5f; public Color flashColour = new Color(1f, 0f, 0f, 0.1f);

 Animator anim;
 AudioSource playerAudio;
 PlayerMovement playerMovement;
 //PlayerShooting playerShooting;
 bool isDead;
 bool damaged;


 void Awake ()
 {
     anim = GetComponent <Animator> ();
     playerAudio = GetComponent <AudioSource> ();
     playerMovement = GetComponent <PlayerMovement> ();
     //playerShooting = GetComponentInChildren <PlayerShooting> ();
     currentHealth = startingHealth;
 }


 void Update ()
 {
     if(damaged)
     {
         damageImage.color = flashColour;
     }
     else
     {
         damageImage.color = Color.Lerp (damageImage.color, Color.clear, flashSpeed * Time.deltaTime);
     }
     damaged = false;
 }


 public void TakeDamage (int amount)
 {
     damaged = true;

     currentHealth -= amount;

     healthSlider.value = currentHealth;

     playerAudio.Play ();

     if(currentHealth <= 0 && !isDead)
     {
         Death ();
     }
 }


 void Death ()
 {
     isDead = true;

     //playerShooting.DisableEffects ();

     anim.SetTrigger ("Die");

     playerAudio.clip = deathClip;
     playerAudio.Play ();

     playerMovement.enabled = false;
     //playerShooting.enabled = false;
 }


 //public void RestartLevel ()
 //{
    // SceneManager.LoadScene (0);
 //}

}

using UnityEngine; using System.Collections;

public class EnemyAttack : MonoBehaviour { public float timeBetweenAttacks = 0.5f; public int attackDamage = 10;

 Animator anim;
 GameObject player;
 PlayerHealth playerHealth;
 //EnemyHealth enemyHealth;
 bool playerInRange;
 float timer;


 void Awake ()
 {
     player = GameObject.FindGameObjectWithTag ("Player");
     playerHealth = player.GetComponent <PlayerHealth> ();
     //enemyHealth = GetComponent<EnemyHealth>();
     anim = GetComponent <Animator> ();
 }


 void OnTriggerEnter (Collider other)
 {
     if(other.gameObject == player)
     {
         playerInRange = true;
     }
 }


 void OnTriggerExit (Collider other)
 {
     if(other.gameObject == player)
     {
         playerInRange = false;
     }
 }


 void Update ()
 {
     timer += Time.deltaTime;

     if(timer >= timeBetweenAttacks && playerInRange /*&& enemyHealth.currentHealth > 0*/)
     {
         Attack ();
     }

     if(playerHealth.currentHealth <= 0)
     {
         anim.SetTrigger ("PlayerDead");
     }
 }


 void Attack ()
 {
     timer = 0f;

     if(playerHealth.currentHealth > 0)
     {
         playerHealth.TakeDamage (attackDamage);
     }
 }

}