Error: Method not found: 'UnityEngine.Rigidbody.Translate'.

 function Fire() {
         
         startpoint.transform.LookAt(transform.position);
         
         // create a new projectile, use the same position and rotation as the Launcher.
         var instantiatedProjectile : Rigidbody = Instantiate (projectile, startpoint.position, startpoint.rotation);
  
         // Give it an initial forward velocity. The direction is along the z-axis of the missile launcher's transform.
         instantiatedProjectile.velocity = startpoint.TransformDirection(Vector3(0, 0, initialSpeed));
         
          //instantiatedProjectile.TransformDirection(EnemyHitPoint.position);
          instantiatedProjectile.Translate((EnemyHitPoint.position - instantiatedProjectile.position) * Time.deltaTime);
          //instantiatedProjectile.TransformDirection(EnemyHitPoint.position);
          
         // Ignore collisions between the missile and the character controller
         Physics.IgnoreCollision(instantiatedProjectile.collider, startpoint.root.collider);
 }

I get an error with the code above. however the function still works as expected in the game play... not sure what is wrong with it or why the error?

Any ideas?