Why Don't my Bullets move???

I was copying the Unity3d Space Shooter tutorial. I made the script to make the bullets shoot,

using UnityEngine;
using System.Collections;

[System.Serializable]
public class Boundary
{
public float xMin, xMax, zMin, zMax;
}

public class PlayerController : MonoBehaviour
{
public float speed;
public float tilt;
public Boundary boundary;

public GameObject shot;
public Transform shotSpawn;
public float fireRate;

private float nextFire;

void Update ()
{
if (Input.GetButton("Fire1") && Time.time > nextFire)
{
nextFire = Time.time + fireRate;
Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
audio.Play ();
}
}

void FixedUpdate ()
{
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");

Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
rigidbody.velocity = movement * speed;

rigidbody.position = new Vector3
(
Mathf.Clamp (rigidbody.position.x, boundary.xMin, boundary.xMax),
0.0f,
Mathf.Clamp (rigidbody.position.z, boundary.zMin, boundary.zMax)
);

rigidbody.rotation = Quaternion.Euler (0.0f, 0.0f, rigidbody.velocity.x * -tilt);
}
}

And when I shoot my bullet, they spawn but don't move, any help? I made the fire rate 0.25, I dragged on the Bullet spawn and bolt.

 

Woops, I fixed it, sorry

 

how did you fix it???

 

It looks like a classic noob logic error. As far as I can tell, the movement code was on the player controller class. It should have been on the bullet prefab.