cannot show my hazard in space shooter

hi gays~

I follow the space shooter in unity and have problem now

I finish chapter 11 of space shooter which is explosions and then I cannot show hazard in play mode end of the came controller part

i don’t know why…T^T…

gays please help me

I made Asteroid prefab and then deleted of Asteroid game object in hierarchy
also my asteroid prefab has ‘random rotator’ ‘mover’ ‘destroy by contact’ scripts and ‘rigid body’ and ‘capsule colander’.

I exactly wrote c# script from tutorial and did not copy ‘done’ scripts

My game controller object has game controller script and include asteroid prefab …

i really do not have any idea, why i cannot show may Asteroid in play move

My space shooter does not have any error and warning

help me… pleaze

This is my came controller script

using UnityEngine;
using System.Collections;

public class GameConroller : MonoBehaviour {

public GameObject hazard;
public Vector3 spawnValues;

void start(){
	SpawnWaves ();

void SpawnWaves()
	Vector3 spawnPosition = new Vector3 (Random.Range(-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z);

	Quaternion spawnRotation = Quaternion.identity;

	Instantiate (hazard, spawnPosition, spawnRotation);		



GameObject newSpawn = Instantiate (hazard, spawnPosition, spawnRotation) as GameObject;

Did you assigned the prefab in the inspector?

Test your prefab pulling it directly to the scene. Is it ok?

Have you checked the values of the spawn positions?

When in play mode, in the Scene view from a far point, can you see the prefab been instantiated???