Damage listener problem

Hello. I have problem with damage listener (just it not works):

Code:java

public void onEnable() {
Bukkit.getServer().getPluginManager().registerEvents(this, this);
}
public void onEntityDamage(EntityDamageByEntityEvent e) {
 
        if (e.getDamager() instanceof WitherSkull) {
            Player ep = (Player) e;
            ep.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS, 2, 1));
        }
 
        if (e instanceof Wither) {
            if (((Wither) e).getHealth() <= 75) {
                ((Wither) e).getWorld().spawnCreature(((Wither) e).getLocation(), CreatureType.BLAZE);
                if(e.getDamager() instanceof Player) {
                    Player epp = (Player) e.getDamager();
                    epp.sendMessage(ChatColor.RED+"[Wither]"+ChatColor.GOLD+" Kill him, my soldiers!");
                }
            }
        }
    }

What's wrong?

 

PluginMan100
You forgot your EventHandler annotation above your event method.