Not Detecting Collision?

Ok so I made a node based Path Finding script for generating random paths:

    var Waypoints : GameObject[];

    function onTriggerEnter (collision : Collider){
       if (collision.gameObject.FindWithTag("Enemy")){
          var random : int;
          random = Random.Range(1,2);
          var place : GameObject = (Waypoints[random]);
          SendMessage("NextLocation", place, SendMessageOptions.DontRequireReceiver);

where an Object moves towards a Waypoint determined by the script. The only problem is that the Waypoint with this script never detects the collision with the Object since I never receive the debug. I have a box collider on the waypoint and a rigid body on the object, so I have no idea why it wouldn’t detect the collision. Any ideas?

collision.gameObject>FindWithTag(“Enemy”)) ???