[Part 4] Unable to damage enemy

[Jason Hahne]

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For both garlic and knife, I’m unable to damage the enemy. For the garlic script, there is a null reference on if(collision.CompareTag("Enemy") && !markedEnemies.Contains(collision.gameObject)) When I debugged projectileWeaponBehavior script, the only things that are getting triggered are player and collector. I think it is not supposed to get the collector as a collision in OnTriggerEnter2D since both the projectile and collector have 2d collider with isTrigger on. OnTriggerEnter2D part of projectileWeaponBehavior script:

<code>protected virtual void OnTriggerEnter2D(Collider2D collision)
{
    if (collision.CompareTag("Enemy"))
    {
        EnemyStats enemy = collision.GetComponent<EnemyStats>();
        enemy.TakeDamage(currentDamage);
        ReducePierce();
    }
    else if (collision.CompareTag("Prop"))
    {
        if(collision.gameObject.TryGetComponent(out BreakableProps breakable))
        {
            breakable.TakeDamge(currentDamage);
            ReducePierce();
        }
    }
}</code>

OnTriggerEnter2D part in garlic script that is getting null reference:

<code>protected override void OnTriggerEnter2D(Collider2D collision)
{
    if(collision.CompareTag("Enemy") && !markedEnemies.Contains(collision.gameObject))
    {
        EnemyStats enemy = collision.GetComponent<EnemyStats>();
        enemy.TakeDamage(currentDamage);

        markedEnemies.Add(collision.gameObject);
    }
    else if (collision.CompareTag("Prop"))
    {
        if (collision.gameObject.TryGetComponent(out BreakableProps breakable) && !markedEnemies.Contains(collision.gameObject))
        {
            breakable.TakeDamge(currentDamage);
            markedEnemies.Add(collision.gameObject);
        }
    }
}</code>

[Terence]

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Hi Jason, did you tag your enemy prefabs “Enemy”? Make sure that the tag has the first character capitalised, and has no spaces before or after (e.g. “enemy” or “Enemy ” won’t work).

For the garlic script, I suspect markedEnemies is null. Make sure that in the Start() function you initialise the variable:

    protected override void Start()
    {
        base.Start();
        markedEnemies = new List<GameObject>();
    }

[Jason Hahne]

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I solved the null reference issue on garlic script, but wasn’t able to solve projectile not detecting enemy.

[Terence]

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It’s very likely the enemy isn’t getting damaged because this line is failing:

    if (collision.CompareTag("Enemy"))
    {
        EnemyStats enemy = collision.GetComponent<EnemyStats>();
        enemy.TakeDamage(currentDamage);
        ReducePierce();
    }

So just double check if your enemy prefabs are tagged correctly. Make sure you set the Tag, not the Layer.

[Jason Hahne]

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I solved the problem. I forgot to put rigidbody2D. Thank you so much for helping me. :D

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