Applying Damage to enemy script not working

I made two scripts, one is called MeleeSystem which is responsible for getting the distance between me and an enemy object/player and based on that, apply 20 damage to that object's health, which is found in my EnemyHealth class.

here's my code

MeleeSystem Class

 #pragma strict
 
 var Damage : int = 20;
 var Distance : float;
 var MaxDistance : float = 1.5f;
 
 function Update()
 {
     if(Input.GetButtonDown("Fire1"))
     {
         var hit : RaycastHit;
         if(Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), hit))
         {
             Distance = hit.distance;
             if(Distance < MaxDistance)
             {                
                 transform.SendMessage("ApplyDamage", Damage, SendMessageOptions.DontRequireReceiver);
             }
         }
     }
 }

EnemyHealth Class

 #pragma strict
 
 var Health = 100;
 
 function ApplyDamage(Damage : int)
 {
     Health -= Damage;
     print(Health);
 }
 
 function Update()
 {
     if(Health <= 0)
     {
         Dead();
     }
 }
 
 function Dead()
 {
     Destroy(gameObject);
 }

I am getting this warning: The referenced script on this behaviour is missing! that's for both the classes. And yes, the classes are correctly placed.