I'm doing the Walker Boys Studio lab 2, part 33. But I'm writing all the scripts in C# to get that sweet auto-complete goodness.

The issue I'm running into occurs when the asteroid hits the player's shield. Pretty sure they're both set up right (a sphere with a sphere collider, IsTrigger=true, and a rigidbody).

Here's the code that runs for the asteroid:

void OnTriggerEnter(Collider other)
{
    if (other.tag == "shield")
    {
       HitShield(other.gameObject);
       ExplodeAsteroid();
       ResetPosition();
    }
}

void HitShield(GameObject other)
{
    scriptShield localShield = (scriptShield)other.GetComponent(typeof(scriptShield));
    localShield.HitShield();
}

The error I'm getting is NullReferenceException: Object reference not set to an instance of an object, which occurs when I try to call localShield.HitShield();. Does it matter that the shield object is a prefab which is instantiated by the player prefab?

How can the object be null if I can read its tags? There's something fundamental I'm missing, right?