Hat Trick Game Tutorial: Balls are not Spawning...

Hi all,

I am working through the “Hat Trick” 2D Tutorial, and I am stuck on the GameController/Random ball spawning part. My code seems to mirror the tutorial exactly, but my balls aren’t spawning. No compiler errors, so I’m kind of at a loss… I noticed there are parts of code in the Tutorial that are now deprecated, but it hasn’t thrown an error for that either. Code posted below, thanks for the help:

using UnityEngine;
using System.Collections;

public class GameController : MonoBehaviour {

    public Camera cam;
    public GameObject ball;
    public float timeLeft;

    private float maxWidth;

    // Use this for initialization
    void Start(){
        if (cam == null){
            cam = Camera.main;
        Vector3 upperCorner = new Vector3(Screen.width, Screen.height, 0.0f);
        Vector3 targetWidth = cam.ScreenToWorldPoint(upperCorner);
        float ballWidth = GetComponent<Renderer>().bounds.extents.x;
        maxWidth = targetWidth.x - ballWidth;

    void FixedUpdate() {
        timeLeft -= Time.deltaTime;

    IEnumerator Spawn ()
        yield return new WaitForSeconds(1.0f);
        while (timeLeft > 0)
            Vector3 spawnPosition = new Vector3(Random.Range(-maxWidth, maxWidth), transform.position.y, 0.0f);
            Quaternion spawnRotation = Quaternion.identity;
            Instantiate(ball, spawnPosition, spawnRotation);
            yield return new WaitForSeconds(Random.Range(1.0f, 2.0f));

Good day.

It seems the GameObject to be instantiated is not assigned correctly. Maybe you should load the prefab via scripting with Resources.Load as GameObject.