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

You spelt rigidbody wrong.

change line 26 to this:

mermii.rigidbody.AddForce(transform.forward*2900);

In order to make sure when you instantiate you put after that
if(mermii.GetComponent() == null)
mermii.AddComponent();