NullReferenceException on my class instantiate.

Questions & Answers
1

I don’t know C# very good so, I’m trying to make a 3d tank arena game, I made a class called bullets to store bullets fired then destroy them after their lifespan is ended, but I’m getting an nullreferenceexception at" bullets[bl].instance = Instantiate(shell, muzzle.position, transform.parent.rotation) as Rigidbody;"

using UnityEngine;
using System.Collections;

public class TurretMovement : MonoBehaviour {

    private class bullet
    {
        public bool alive;
        public Rigidbody instance;
        public int life;
    }

    private bullet[] bullets = new bullet[200];
    public Rigidbody shell;  
    public Transform muzzle;
    public float currentAngle;
    private float yPos;
    private Animation anim;
    public int Ammo = 5;
    private int Tick = 0;
    private int bl = 0;

	// Use this for initialization
	void Start () {
        yPos = muzzle.position.y;
        anim = GetComponentInParent<Animation>();
	}
      
 
    // Update is called once per frame
    void Update ()
    {
        for (int i = 0; i < bl; i++ )
        {            
            if(bullets*.life <= 0)*

{
bullets*.alive = false;*
Destroy(bullets*.instance);*
}
else
{
bullets*.life -= 10;*
}
}
Tick += 10;
if(Tick % 1000 == 0 && Ammo < 5)
{
Ammo++;
Tick = 0;
}
if (Input.GetKeyDown(KeyCode.Space))
{
if (!anim.isPlaying && Ammo > 0)
{
Ammo–;
anim.Play(“ShootAnim”);
currentAngle = transform.parent.rotation.eulerAngles.y;
bullets[bl].instance = Instantiate(shell, muzzle.position, transform.parent.rotation) as Rigidbody;
bullets[bl].alive = true;
bullets[bl].life = 5000;
bullets[bl++].instance.AddRelativeForce(new Vector3(500, 0, 0));
}
}
}
}

2

I think that you need to create bullet first. I mean that this line: private bullet[] bullets = new bullet[200]; is creating an array but not an object for each field in this array try to add this line bullets[bl] = new bullet(); before bullet[bl].instance = ...