Ai Destinations not changing when using length of raycast,

im using A* Pathing Project for pathfinding and im trying to make a script that changes the AI Destination Setter target based on the player distance from the enemy using raycast and it just doesnt change the target no matter how far i am from the enemy it just always set to player

 //draws a raycast from enemy to play
         RaycastHit2D hit = Physics2D.Linecast(transform.position, gb.transform.position);
         Debug.DrawLine(transform.position, gb.transform.position, Color.green);
         //measures the range of the raycast
         if (hit.distance <= range)
         {
             //sets the Ai Destination Setters target to the player if the 
             //distance of the raycast is below a ceratin amount
             refScript.target = gb.transform;
         }
         else
         {
             //if its higher then the amount then it will be set to no target
             refScript.target = null;
         },