UnityEngine.GameObject Error

 #pragma strict
 var mermi : GameObject;
 var kalanmermi : float = 30;
 var yazi : GUIText;
 var muzzleflash : Renderer;
 var muzzlelight : Light;
 var ateszamani : float = 0;
 var siralama : float = 0.1;
 
 function Start () {
     yazi.enabled = false;
     muzzleflash.enabled = false;
     muzzlelight.enabled = false; 
 }
 
 function Update () {
     if(ateszamani > 0) {
         ateszamani -=Time.deltaTime;
     }
     if(ateszamani < 0){
         ateszamani = 0;
     }
     if(Input.GetMouseButton(0)&& kalanmermi){
         if(ateszamani == 0){
             var mermii = Instantiate(mermi,transform.position,Quaternion.identity);
             mermii.rigibody.AddForce(transform.forward*2900);
             ateszamani = siralama;
             Ammo();
             Effek();
         }
     }
 }
 
 function Ammo () {
     kalanmermi --;
     if(kalanmermi < 1){
         yazi.enabled = true;
         yield WaitForSeconds (2);
         yazi.enabled = false;
         kalanmermi +=30;
     }
 }
 
 
 function Effek () {
     muzzleflash.renderer.enabled = true;
     muzzlelight.enabled = true;
     yield WaitForSeconds(0.02);
     muzzleflash.renderer.enabled = false;
     muzzlelight.enabled = false;
 }

Error : Assets/Scriptler/Namlu.js(26,8): BCE0019: 'rigibody' is not a member of 'UnityEngine.GameObject'.

Help Me Please