BCE0023: No appropriate version of 'UnityEngine.Object.Instantiate' for the argument list '(UnityEngine.GameObject, UnityEngine.GameObject)' was found.

i get the BCE0023 error and i cant find out why

 //Variables
 var ammo : int = 100;
 var fireRate : float = 0.0;
 var Effect : Transform;
 var TheDammage = 100;
 var muzzelflash : GameObject;
 var ShootingPoint : GameObject; 
  private var nextFire : float = 0.0;
  
 
  
  function Update()
  {
         var hit : RaycastHit;
         var ray : Ray = Camera.main.ScreenPointToRay(Vector3(Screen.width*0.5, Screen.height*0.5, 0));
  
  
        if(Input.GetButton("Fire1")&& ammo>0)
        { 
              if (Physics.Raycast (ray, hit, 100))
               {
     
             }
              if(Time.time > nextFire)
              {
                  var particleClone = Instantiate(Effect, hit.point, Quaternion.LookRotation(hit.normal));
                  Destroy(particleClone.gameObject, 1);
                  hit.transform.SendMessage("ApplyDammage", TheDammage, SendMessageOptions.DontRequireReceiver);
     }
              if(Time.time > nextFire)
              {
                  nextFire = Time.time + fireRate;
                  GetComponent.<AudioSource>().Play();
                  //here's the problem
                  Instantiate(muzzelflash, ShootingPoint);  
                  ammo -= 1;
              }
             
         }
         if(ammo <= 30)
         {
           if(Input.GetKeyDown("r"))
           {
            ammo = 30;
           }
        }
  }