Zombie AI not working?!

My zombie isn't working and not quite sure what the problem is. I got this script off of a website and it was working before but now it isn't. I know this should be posted on unity answers instead, but it was rejected twice so I'm looking for here.

Here is the error: NullReferenceException: Object reference not set to an instance of an object Zombie.FixedUpdate () (at Assets/scripts/Scene5 (level 1)/Zombie.js:18)

Here is the script:

Code (JavaScript):

1.     #pragma strict
2.     varVisionDistance:float=200;
3.     varMovementSpeed:float=2;
4.     varHealth:int=3;
5.     functionFixedUpdate(){
6.     // Get the Player object
7.     var player :GameObject=GameObject.Find("Player");
8.     var characterController :CharacterController=GetComponent(CharacterController);
9.     // Get the position of the Zombie's eyes
10.     var eyePosition :Vector3= transform.position;
11.     eyePosition.y += characterController.height;
12.     // Get the difference between the player and the Zombie positions
13.     // This creates a direction vector pointing in the direction of the Player.
14.     var lookDirection = player.transform.position - eyePosition;
15.     lookDirection = lookDirection.normalized;
16.     // Only look for the player or objects that are part of the scenery (terrain, buildings, etc.)
17.     var layerMask :int=1<<LayerMask.NameToLayer("Player")|1<<LayerMask.NameToLayer("Default");
18.     // The direction the Zombie will move, defaults to standing still
19.     var movementDirection :Vector3=Vector3.zero;
20.     // hitInfo will contain information about what the Zombie can see.
21.     var hitInfo :RaycastHit;
22.     if(Physics.Raycast(eyePosition, lookDirection, hitInfo,VisionDistance, layerMask)){
23.     // If the Zombie can see the Player move toward them.
24.     if(hitInfo.collider.gameObject == player){
25.     movementDirection = lookDirection;
26.     movementDirection.y =0;
27.     movementDirection = movementDirection.normalized;
28.     }
29.     }
30.     // Face and move in the chosen direction
31.     if(movementDirection !=Vector3.zero){
32.     transform.rotation =Quaternion.LookRotation(movementDirection,Vector3.up);
33.     }
34.     characterController.SimpleMove(movementDirection *MovementSpeed);
35.     }

Any help is appreciated.

 

First of all use code tags. Code isn't readable without them.

As for your error, it's saying there is a null reference. So in your script you're trying to get access to something that doesn't exist

 

Thanks for the help but I still can't find the problem.

If it helps, this is the line of the error (line 14):
var lookDirection = player.transform.position - eyePosition;

 

use code tags, we can't read your code.. http://forum.unity3d.com/threads/using-code-tags-properly.143875/

 

Thanks for the help with code tags.