Phantom Kit - - HELP PLZ

package me.Hatter274;

import java.util.HashSet;
import java.util.Set;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.ItemStack;

public class Phantom implements Listener
{

	Main plugin;
	public Phantom(Main instance)
	{
		this.plugin = instance;
	}

	private Set<String> cooldown = new HashSet<String>();

	@EventHandler
	public void onPlayerInteract(PlayerInteractEvent e)
	{
		final Player p = e.getPlayer();
		if (e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK)
		{
			if (cooldown.contains(p.getName()))
			{
				p.sendMessage(ChatColor.RED + "You Are Still On Cooldown!");
			} else {
				cooldown.add(p.getName());
				ItemStack helm = new ItemStack (Material.LEATHER_HELMET);
				ItemStack chest = new ItemStack (Material.LEATHER_CHESTPLATE);
				ItemStack leggs = new ItemStack (Material.LEATHER_LEGGINGS);
				ItemStack boots = new ItemStack (Material.LEATHER_BOOTS);
				helm.setDurability((short)(1));
				chest.setDurability((short)(1));
				leggs.setDurability((short)(1));
				boots.setDurability((short)(1));
				p.getInventory().setHelmet(helm);
				p.getInventory().setHelmet(chest);
				p.getInventory().setHelmet(leggs);
				p.getInventory().setHelmet(boots);
				p.setFlying(true);
				p.setAllowFlight(true);
				p.sendMessage(ChatColor.BLUE + "WOOSH! You Now Have Fly Abilities For 10 Seconds!");
				plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable()
				{
					@Override
					public void run()
					{
						p.setAllowFlight(false);
						p.setFlying(false);
						p.getInventory().setHelmet(new ItemStack(Material.CHAINMAIL_HELMET));
						p.getInventory().setHelmet(new ItemStack(Material.CHAINMAIL_CHESTPLATE));
						p.getInventory().setHelmet(new ItemStack(Material.CHAINMAIL_LEGGINGS));
						p.getInventory().setHelmet(new ItemStack(Material.CHAINMAIL_BOOTS));
						p.sendMessage("You Have Now Lost Your Fly Abilities");
					}
				}, 20L * 10L);
				plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable()
				{
					@Override
					public void run()
					{
						cooldown.remove(p.getName());
						p.sendMessage(ChatColor.BLUE + "You Can Now Use Your Feather Again!");
					}
				}, 20L * 30L);
			}
		}
	}

}