A NullReferenceException to a static variable.

Unity Engine
1 
public GameObject HealthPoint;
    static GameObject[] HP = new GameObject[];
    // Use this for initialization
    void Start () {
        for(int i = 0; i < StatsManager.ChassisHealth;i++)
        {
            HP[i] = Instantiate(HealthPoint,new Vector2(transform.position.x, transform.position.y),transform.rotation,this.gameObject.transform);
        }
    }
   
    // Update is called once per frame
    void LateUpdate () {
        for (int j = StatsManager.ChassisHealth; j > P1Tank.CurrentHealth; j--) {
            HP [j].GetComponent<Image> ().color = Color.red;
        }
    }

I am not entirely sure why it is returning this error and after spending quite a while on it, I just can’t seem to figure out what the issue is.

2

The code shouldn’t even compile with this line. You have to specify the size of the array.
And you should probably use a List instead, so it can grow dynamically. Assuming that your current array will always be big enough is prone to errors. The loops could easily cause IndexOutOfRangeExceptions.

3

Didn’t even know that Lists were a thing.