I'm still having Trouble with this AI script

// Make sure there is always a character controller @script RequireComponent (CharacterController)

function Start () { // Auto setup player as target through tags if (target == null && GameObject.FindWithTag("Player")) target = GameObject.FindWithTag("Player").transform;

 Patrol();

}

function Patrol () { var curWayPoint = AutoWayPoint.FindClosest(transform.position); while (true) { var waypointPosition = curWayPoint.transform.position; // Are we close to a waypoint? -> pick the next one! if (Vector3.Distance(waypointPosition, transform.position) < pickNextWaypointDistance) curWayPoint = PickNextWaypoint (curWayPoint);

     // Attack the player and wait until
     // - player is killed
     // - player is out of sight     
     if (CanSeeTarget ())
         yield StartCoroutine("AttackPlayer");

     // Move towards our target
     MoveTowards(waypointPosition);

     yield;
 }

}

function CanSeeTarget () : boolean { if (Vector3.Distance(transform.position, target.position) > attackRange) return false;

 var hit : RaycastHit;
 if (Physics.Linecast (transform.position, target.position, hit))
     return hit.transform == target;

 return false;

}

function AttackPlayer () { var lastVisiblePlayerPosition = target.position; while (true) { if (CanSeeTarget ()) { // Target is dead - stop hunting if (target == null) return;

         // Target is too far away - give up 
         var distance = Vector3.Distance(transform.position, target.position);
         if (distance > attackRange * 3)
             return;

         lastVisiblePlayerPosition = target.position;
         if (distance > dontComeCloserRange)
             MoveTowards (lastVisiblePlayerPosition);

             //Attack player with "Attack" animation which is       basically a clawing and biting animation
         //this "Attack" is supposed to inflict damage to the FPS player
         else {
             modelAnimation.CrossFade("Attack");
             RotateTowards(lastVisiblePlayerPosition);
         }

         var forward = transform.TransformDirection(Vector3.forward);
         var targetDirection = lastVisiblePlayerPosition - transform.position;
         targetDirection.y = 0;

         var angle = Vector3.Angle(targetDirection, forward);
     } 

     yield;
 }

}

function SearchPlayer (position : Vector3) { // Run towards the player but after 3 seconds timeout and go back to Patroling var timeout = 3.0; while (timeout > 0.0) { MoveTowards(position);

     // We found the player
     if (CanSeeTarget ())
         return;

     timeout -= Time.deltaTime;
     yield;
 }

}

function RotateTowards (position : Vector3) { SendMessage("SetSpeed", 0.0);

 var direction = position - transform.position;
 direction.y = 0;
 if (direction.magnitude < 0.1)
     return;

 // Rotate towards the target
 transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
 transform.eulerAngles = Vector3(0, transform.eulerAngles.y, 0);

}

function MoveTowards (position : Vector3) { var direction = position - transform.position; direction.y = 0; if (direction.magnitude < 0.5) { SendMessage("SetSpeed", 0.0); return; }

 // Rotate towards the target
 transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
 transform.eulerAngles = Vector3(0, transform.eulerAngles.y, 0);

 // Modify speed so we slow down when we are not facing the target
 var forward = transform.TransformDirection(Vector3.forward);
 var speedModifier = Vector3.Dot(forward, direction.normalized);
 speedModifier = Mathf.Clamp01(speedModifier);

 // Move the character
 direction = forward * speed * speedModifier;
 GetComponent (CharacterController).SimpleMove(direction);

 SendMessage("SetSpeed", speed * speedModifier, SendMessageOptions.DontRequireReceiver);

}

function PickNextWaypoint (currentWaypoint : AutoWayPoint) { // We want to find the waypoint where the character has to turn the least

 // The direction in which we are walking
 var forward = transform.TransformDirection(Vector3.forward);

 // The closer two vectors, the larger the dot product will be.
 var best = currentWaypoint;
 var bestDot = -10.0;
 for (var cur : AutoWayPoint in currentWaypoint.connected) {
     var direction = Vector3.Normalize(cur.transform.position - transform.position);
     var dot = Vector3.Dot(direction, forward);
     if (dot > bestDot && cur != currentWaypoint) {
         bestDot = dot;
         best = cur;
     }
 }

 return best;