i dont get this code, please help

Type `Bullet' does not contain a definition for #speed' and no extension method #speed' of type #Bullet' could be found #are you missing a using directive or an assembly reference?

what is the problem???

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Gun : MonoBehaviour {
5.     public GameObject bullet;
6.     public float speed;
7.  
8.     // Use this for initialization
9.     void Start () {
10.         bullet.GetComponent<Bullet>().speed = speed;
11.    
12.     }
13.    
14.     // Update is called once per frame
15.     void Update () {
16.    
17.     }
18.  
19.     public void Shoot()
20.     {
21.         Instantiate(bullet, transform.position, transform.rotation);
22.     }
23. }
24.  

 

your bullet script doesn't have a public variable called "speed"...

 

This.