Bones rotation from script with LateUpdate

So i have an AI that have some animations but i also need the head to rotate to player direction but its not working neither in late update . Here is the Code:

Code (csharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class AI_chasing : MonoBehaviour {
7.     static public Transform player;
8.     [SerializeField]private float speed;
9.     [SerializeField]private float movespeed;
10.     [SerializeField]private Transform head;
11.     private  Animator anim;
12.     // Use this for initialization
13.     void Start () {
14.         player = GameObject.Find ("FPSController").transform;
15.         anim=this.GetComponent<Animator>();
16.     }
17.    
18.     // Update is called once per frame
19.     void Update () {
20.         Vector3 direction = player.position - this.transform.position;
21.         direction.y = 0;
22.         //    float angle = Vector3.Angle (direction, head.forward);
23.         if (Vector3.Distance (player.position, this.transform.position) < 10) {
24.             this.transform.rotation = Quaternion.Slerp (this.transform.rotation, Quaternion.LookRotation (direction), speed * Time.deltaTime);
25.             anim.SetBool ("is_idle", false);
26.             if (direction.magnitude > 1.3f) {
27.                 this.transform.Translate (0, 0, movespeed * Time.deltaTime);
28.                 anim.SetBool ("is_running", true);
29.                 anim.SetBool ("is_attacking", false);
30.             } else {
31.                 anim.SetBool ("is_attacking", true);
32.                 anim.SetBool ("is_running", false);
33.             }
34.         } else {
35.             anim.SetBool ("is_idle", true);
36.             anim.SetBool ("is_running", false);
37.             anim.SetBool ("is_attacking", false);
38.         }
39.     }
40.     void LateUpdate()
41.     {
42.         Vector3 direction2 = player.position - head.transform.position;
43.         head.transform.rotation = Quaternion.Slerp (head.transform.rotation, Quaternion.LookRotation (direction2), speed * Time.deltaTime);
44.     }
45. }
46.  

I don't know why, please help. :L

 

any updates with it ?

 

It looks like the variable "head" is not being assigned a value...
If it would be filled with the right Transform, you need to use head.rotation instead of head.transform.rotation. (same with position)
Hope it helps.