Ta certo assim?

package me.trow.TGWarpGUI;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin {

    public static int i=0;
    public static String titulo;
    public static Inventory minv = Bukkit.createInventory(null, i, titulo);

    public void onEnable(){
        ConsoleCommandSender b = Bukkit.getConsoleSender();
        saveDefaultConfig();
        b.sendMessage("§6=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
        b.sendMessage("§3[TGWarpGUI] §bAtivado...");
        b.sendMessage("§3Criador: §3Trow");
        b.sendMessage("§bAgradeco por usar meu(s) plugin(s)");
        b.sendMessage("§6=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
        this.i = 0;
        this.titulo = "§6§lTitulo §4§l- §2§lGUI";
    }

    public void onDisable(){
        ConsoleCommandSender b = Bukkit.getConsoleSender();
        b.sendMessage("§6=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
        b.sendMessage("§3[TGWarpGUI] §bDesativado...");
        b.sendMessage("§3Criador: §3Trow");
        b.sendMessage("§bAgradeco por usar meu(s) plugin(s)");
        b.sendMessage("§6=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
    }

    public void criarGUI(Player p){
        File f = new File(getDataFolder(), "warps.yml");
        FileConfiguration fc = YamlConfiguration.loadConfiguration(f);
        if(fc.getString("Warps") == null){
            p.sendMessage("§cNao ah Warps setadas.");
            return;
        }
        if(minv.contains(i)){
            i++;
        }
        minv.setItem(i, new ItemStack(Material.DIRT, 1));
        minv.setItem(i, new ItemStack(Material.DIAMOND, 1));
        p.openInventory(minv);
    }

    @EventHandler
    public void clicarNoGUI(InventoryClickEvent e){
        Player p = (Player)e.getWhoClicked();
        ItemStack item = e.getCurrentItem();
        Inventory inv = e.getInventory();
        if(inv.getName().equalsIgnoreCase(minv.getName())){
            if(item.getType() == Material.DIRT){
                item.setAmount(0);
                p.sendMessage("§aIsso e terra!");
                p.closeInventory();
            }
        }
    }

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(!(sender instanceof Player)){
            sender.sendMessage("§cUse este comando in-game.");
            return true;
        }
        Player p = (Player)sender;
        if(cmd.getName().equalsIgnoreCase("warp")){
            if(args.length == 0){
                criarGUI(p);
            }
        }
        if(cmd.getName().equalsIgnoreCase("setwarp")){
            File f = new File(getDataFolder(), "warps.yml");
            FileConfiguration fc = YamlConfiguration.loadConfiguration(f);
            if(args.length == 0){
                sender.sendMessage("§cUse: §f/warp §6<Nome_Da_Warp>§c.");
                return true;
            }
            String warp = args[0];
            fc.set("Warps."+warp+".Mundo", p.getWorld().getName());
            fc.set("Warps."+warp+".X", p.getLocation().getBlockX());
            fc.set("Warps."+warp+".Y", p.getLocation().getBlockY());
            fc.set("Warps."+warp+".Z", p.getLocation().getBlockZ());
            p.sendMessage("§aWarp §f" + warp + "§a Setada com sucesso!");
            try{
                fc.save(f);
            }catch (IOException e){
                e.printStackTrace();
            }
        }
        return false;
    }

}