Compiler error with A.I movement Script

So I have a script that basically makes the enemy object look at the player, and move towards the player if they are a certain distance away. However, I am getting a compiler error saying that "An instance of type 'UnityEngine.CharacterController' is required to access non static member 'Move'." The prefab that this script is attached to has a CharacterController component, so I am not sure what is wrong. Here is the script:

 //Inspector variables
 var target : Transform;//Target object of the enemy, i.e. "Player" object
 var Speed : float;//Speed of the enemy object
 var maxMoveDistance : int;// Max Distance allowed between enemy and player before enemy moves towards player
 var minMoveDistance : int;//Minimum distance from target before enemy will stop moving
 
 @script RequireComponent(CharacterController)
 
 function Update () 
 {
     transform.LookAt(target);
     
     var controller : CharacterController = GetComponent(CharacterController);
     
     var dist = (Vector3.Distance(transform.position,target.position));
     
     if (dist > maxMoveDistance && !(dist < minMoveDistance))
     {
         var dir : Vector3 = target.position;
         CharacterController.Move(dir * Speed);
         //transform.position = Vector3.MoveTowards(transform.position, target.position, Speed);
     }
 }