,,SeekSteer" problem...

public class SeekSteer : MonoBehaviour {

 public Transform[] waypoints;
 public float waypointRadius = 1.5f;
 public float damping = 0.1f;
 public bool loop = false;
 public float speed = 2.0f;
 public bool faceHeading = true;

 private Vector3 currentHeading,targetHeading;
 private int targetwaypoint;
 private Transform xform;
 private bool useRigidbody;
 private Rigidbody rigidmember;


 // Use this for initialization
 protected void Start ()
 {
     xform = transform;
     currentHeading = xform.forward;
     if(waypoints.Length<=0)
     {
         Debug.Log("No waypoints on "+name);
         enabled = false;
     }
     targetwaypoint = 0;
     if(rigidbody!=null)
     {
         useRigidbody = true;
         rigidmember = rigidbody;
     }
     else
     {
         useRigidbody = false;
     }
 }


 // calculates a new heading
 protected void FixedUpdate ()
 {
     targetHeading = waypoints[targetwaypoint].position - xform.position;

     currentHeading = Vector3.Lerp(currentHeading,targetHeading,damping*Time.deltaTime);
 }

 // moves us along current heading
 protected void Update()
 {
     if(useRigidbody)
         rigidmember.velocity = currentHeading * speed;
     else
         xform.position +=currentHeading * Time.deltaTime * speed;
     if(faceHeading)
         xform.LookAt(xform.position+currentHeading);

     if(Vector3.Distance(xform.position,waypoints[targetwaypoint].position)<=waypointRadius)
     {
         targetwaypoint++;
         if(targetwaypoint>=waypoints.Length)
         {
             targetwaypoint = 0;

         }
     }
 }


 // draws red line from waypoint to waypoint
 public void OnDrawGizmos()
 {
     Gizmos.color = Color.red;
     if(waypoints==null)
         return;
     for(int i=0;i< waypoints.Length;i++)
     {
         Vector3 pos = waypoints[i].position;
         if(i>0)
         {
             Vector3 prev = waypoints[i-1].position;
             Gizmos.DrawLine(prev,pos);
         }
     }
 }