Object reference not set to an instance of an object for a Animation?

Greetings,
Recently for a while I've been struggling with this problem. In the enemyhealth script the death method is suppose to play the death animation clip from a zombie that I got free from the Assets store however, it keeping giving me the "Object reference not set to an instance of an object" error when the function is called, and I can't figure out why please help me. I also have the animator controller attached to the zombie. Anything neccesary is attached. I've also attached my script where the zombie can attack, but I don't think this causes anything.

Thanks

Code (CSharp):

1. //EnemyHealth Script
2.  
3. void Update ()
4.     {
5.         if(EnemHealth <= 0)
6.             Death();
7.            
8.     }
9.  
10.     public void TakeDamage(float Dam)
11.     {
12.         EnemHealth -= Dam;
13.     }
14.  
15.     void Death()
16.     {
17.        
18.         navMesh.enabled = false;
19.         anim.SetBool("isDead",true);
20.         //coll.isTrigger = true;
21.    
22.         Destroy(gameObject,1.5f);
23.     }

Code (CSharp):

1. //EnemyAttack Script
2. void OnTriggerStay (Collider col)
3.     {
4.         timer += Time.deltaTime;
5.  
6.         if (col.gameObject.tag == "Player" && timer > timeBetweenAtks)
7.         {
8.             timer = 0.0f;
9.             playHealth.TakeDamage (attackDam);
10.             playHealth.takenDam = true;
11.             anim.SetBool("isAttacking",true);
12.         }
13.     }
14.  
15.     void OnTriggerExit(Collider col)
16.     {
17.         if (col.gameObject.tag == "Player")
18.         {
19.             playHealth.takenDam = false;
20.             anim.SetBool("isAttacking",false);
21.         }
22.     }

 

NeverMind I fixed it, I'm so blind, I never set up my reference for the animator.