what is the problem with this MeleeSystem

 var range: float = 1.8;
 var attackInterval: float = 0.7;
 var meleeDamage: float = 30;
 private var nextAttack: float = 0;
  
 function MeleeAttack(){
   if (Time.time > nextAttack){ // only repeat attack after attackInterval
     nextAttack = Time.time + attackInterval;
     // get all colliders whose bounds touch the sphere
     var colls: Collider[] = Physics.OverlapSphere(transform.position, range);
     for (var hit : Collider in colls) {
       if (hit && hit.tag == "Enemy"){ // if the object is an enemy...
         // check the actual distance to the melee center
         var dist = Vector3.Distance(hit.transform.position - transform.position);
         if (dist <= range){ // if inside the range...
           // apply damage to the hit object
           hit.SendMessage("ApplyDamage", meleeDamage);
         }
       }
     }
   }
 }
  
 function Update(){
   if (Input.GetButtonDown("Fire1")){
     MeleeAttack();
   }
 }

i keep getting the complier error: Assets/MeleeSystem.js(16,36): BCE0017: The best overload for the method 'UnityEngine.Vector3.Distance(UnityEngine.Vector3, UnityEngine.Vector3)' is not compatible with the argument list '(UnityEngine.Vector3)'.