Solved Can't assign effect to Entity

Hello! I am developing an add-on for a plugin, and I have an item which I want to give whoever it hits a levitation, blindness and night vision ( Blindness + Night Vision = Total Blindness ) for 3 seconds, and then it will make the player explode.

Code:

@EventHandler
    public void onEntityDamageByEntity(EntityDamageByEntityEvent event) throws InterruptedException {
        if (event.getDamager() instanceof Player && event.getEntity() instanceof LivingEntity) {
            Player attacker = (Player) event.getDamager();
            LivingEntity damaged = (LivingEntity) event.getEntity();
            if (SlimefunManager.isItemSimilar(attacker.getItemInHand(), ItemStacks.ETHERIAL_BALANCE_ROD_STACK, true)) {
                damaged.addPotionEffect(new PotionEffect(PotionEffectType.LEVITATION, 3, 3));
                damaged.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS, 3, 1));
                damaged.addPotionEffect(new PotionEffect(PotionEffectType.NIGHT_VISION, 3, 1));
                new BukkitRunnable() {
                    @Override
                    public void run() {
                        damaged.getLocation().getWorld().createExplosion(damaged.getLocation(), 2F, false, false);
                    }
                }.runTaskLater(this.plugin, 60);
            }
        }
    }

The code works perfectly, up until the potion part. For some reason, Bukkit just skips this code completely and keeps going. So it makes the entity explode after 3 seconds, but it doesn't add the effects before it does it. I heard this is how you do it, but it doesn't work. Am I doing something wrong?

EDIT: Nor the compiler, the IDE or the console throw any errors.

 

I don't understand. The explosion works fine. I know it's on ticks, so I added 60 ticks because 20 ticks = 1 second. I don't understand why I should modify something that works fine.

 

OH! I didn't realize that! I'll go and test it, then close the thread if it fixes it!