Error

package me.cooper.AusBrawl;

import java.util.HashMap;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Effect;
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.entity.EntityDamageEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.ItemStack;

public class Agility implements Listener{

    public static Main plugin;


    public Agility(Main instance) {
        plugin = instance;
    }

    public HashMap<String, Long> cooldown = new HashMap<String, Long>();

    public int cooldownTime = 1;

    @EventHandler
     public void onPlayerInteract(PlayerInteractEvent event) {
     final Player player = event.getPlayer();
      if(player.getEquipment().getHelmet().getType() == Material.MOB_SPAWNER){
        if(event.getAction() == Action.LEFT_CLICK_AIR || event.getAction() == Action.LEFT_CLICK_BLOCK){
            if(player.getInventory().getItemInHand().getType() == Material.AIR){
             if (cooldown.containsKey(player.getName())) {
             long diff = (System.currentTimeMillis() - cooldown.get(player.getName())) / 1000;
             if (diff < cooldownTime) {
             player.sendMessage(ChatColor.RED + "[C]" + ChatColor.LIGHT_PURPLE + " Aerial Leap" + ChatColor.YELLOW + " is still on a " + ChatColor.LIGHT_PURPLE + (cooldownTime - diff) + "s" + ChatColor.YELLOW + " cooldown!");
             return;
             }

             cooldown.put(player.getName(), System.currentTimeMillis());

             }

             cooldown.put(player.getName(), System.currentTimeMillis());
             if(player.getEquipment().getHelmet().getType() == Material.MOB_SPAWNER){
            	 ItemStack agilityhelmet = new ItemStack(Material.MOB_SPAWNER);
              if(player.hasPermission("aMod.Agility")){
             if ((event.getAction() == Action.LEFT_CLICK_BLOCK) || (event.getAction() == Action.LEFT_CLICK_AIR)) {
                 if(player.getInventory().getItemInHand().getType() == Material.AIR){
              player.setVelocity(player.getEyeLocation().getDirection().multiply(1.4));
      player.getWorld().playEffect(player.getLocation(), Effect.STEP_SOUND,Material.SNOW_BLOCK.getId());
         player.setFallDistance(0);
         player.sendMessage(ChatColor.RED + "[Ability]" + ChatColor.YELLOW + " You used" + ChatColor.LIGHT_PURPLE + " Aerial Leap" + ChatColor.YELLOW + "!");
                }
         }
        }
              Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
            	  public void run() {
            	    if (Agility.this.cooldown.containsKey(player.getName())) {
            	      Agility.this.cooldown.remove(player.getName());
            	      player.sendMessage(ChatColor.RED + "[C] " + ChatColor.YELLOW + "[Recharged]" + ChatColor.LIGHT_PURPLE + " Leap");
            	/*    */
            	/*    */
            	/*    */   {
            	/*    */   }
            	/*    */ }
            	  }},20);

      }
        }
      }
     }
    }

 public void enabled(boolean b) {
  // TODO Auto-generated method stub

 }
}