Help with map rollback

Hey guys I have made a minigame TNTWars and I wanna rollback the map
But the rollback doesn't work look at the end of the code

Code:

package me.Funergy.tntwars;
 
import java.util.ArrayList;
import java.util.Random;
import java.util.logging.Logger;
 
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.Sound;
import org.bukkit.World;
import org.bukkit.WorldCreator;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.PlayerDeathEvent;
import org.bukkit.event.player.PlayerDropItemEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.event.player.PlayerRespawnEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Mainclass extends JavaPlugin implements Listener {
    public static Mainclass instance;
    public final Logger logger = Logger.getLogger("Minecraft");
    String world = "world";
    public ArrayList<String> red = new ArrayList<String>();
    public ArrayList<String> blue = new ArrayList<String>();
    public ArrayList<String> online = new ArrayList<String>();
    public ArrayList<String> spec = new ArrayList<String>();
    int start;
    int timer;
    public boolean starttimer;
    public int end2;
    public int number = 10;
    public int startgame = 1200;
    public static ItemStack tnt = new ItemStack(Material.TNT, 64);
    {
        ItemMeta imtnt = tnt.getItemMeta();
        imtnt.setDisplayName("§cTNT");
        tnt.setItemMeta(imtnt);
    }
    public static ItemStack redstone = new ItemStack(Material.REDSTONE, 64);
    {
        ItemMeta imredstone = redstone.getItemMeta();
        imredstone.setDisplayName("§5Redstone");
        redstone.setItemMeta(imredstone);
    }
    public static ItemStack button = new ItemStack(Material.STONE_BUTTON, 64);
    {
        ItemMeta imbutton = button.getItemMeta();
        imbutton.setDisplayName("§6Button");
        button.setItemMeta(imbutton);
    }
    public static ItemStack brick = new ItemStack(Material.BRICK, 64);
    {
        ItemMeta imbrick = brick.getItemMeta();
        imbrick.setDisplayName("§6Building Blocks");
        brick.setItemMeta(imbrick);
    }
    public static ItemStack water = new ItemStack(Material.WATER_BUCKET, 64);
    {
        ItemMeta imwater = water.getItemMeta();
        imwater.setDisplayName("§bWater");
        water.setItemMeta(imwater);
    }
    public static ItemStack repeater = new ItemStack(Material.DISPENSER, 64);
    {
        ItemMeta imdisp = repeater.getItemMeta();
        imdisp.setDisplayName("§2Dispenser");
        repeater.setItemMeta(imdisp);
    }
    public static ItemStack redtorch = new ItemStack(
            Material.REDSTONE_TORCH_ON, 64);
    {
        ItemMeta imredtorch = redtorch.getItemMeta();
        imredtorch.setDisplayName("§bRedstoneTorch");
        redtorch.setItemMeta(imredtorch);
    }
    public static ItemStack slab = new ItemStack(Material.LADDER, 64);
    {
        ItemMeta imslab = slab.getItemMeta();
        imslab.setDisplayName("§6Ladder");
        slab.setItemMeta(imslab);
    }
 
    public void onEnable() {
        Mainclass.instance = this;
        PluginDescriptionFile pdfFile = this.getDescription();
        this.logger.info(pdfFile.getName() + " Has Been Enabled!");
        for (String str : online) {
            Player online = Bukkit.getPlayer(str);
            org.bukkit.World world = online.getWorld();
            world.setAutoSave(false);
        }
        Bukkit.getPluginManager().registerEvents(this, this);
        for (Player p : Bukkit.getOnlinePlayers()) {
            p.getWorld().setPVP(false);
        }
        Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
 
            @Override
            public void run() {
                Bukkit.broadcastMessage("§c[TNTWars] Wanna know how much time we have left do /time");
 
            }
 
        }, 600L, 1200L);
        Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
 
            @Override
            public void run() {
                Bukkit.broadcastMessage("§c[TNTWars] Killing your own team with tnt will result a ban!");
 
            }
 
        }, 1200L, 1200L);
 
    }
 
    @EventHandler
    public void playerjoin(PlayerJoinEvent e) {
        online.add(e.getPlayer().getName());
        String player = e.getPlayer().getName();
        Player p = e.getPlayer();
        getConfig().options().copyDefaults(true);
        saveConfig();
        int xlobby = getConfig().getInt("xlobby");
        int ylobby = getConfig().getInt("ylobby");
        int zlobby = getConfig().getInt("zlobby");
        org.bukkit.World world = p.getWorld();
        p.teleport(new Location(world, xlobby, ylobby, zlobby));
        e.setJoinMessage(null);
 
        Bukkit.broadcastMessage(e.getPlayer().getName()
                + " §6Has joined the game! [" + online.size()
                + "/12]. 6 players to start");
        if (red.size() > blue.size()) {
            blue.add(player);
            p.sendRawMessage("§8You are in the §l§bBlue §8team!");
        } else if (red.size() < blue.size()) {
            red.add(player);
            p.sendRawMessage("§8You are in the §l§cRed §8team!");
        } else {
            Integer team = new Random().nextInt(2);
            if (team == 1) {
                red.add(player);
                p.sendRawMessage("§8You are in the §l§cRed §8team!");
            } else {
                blue.add(player);
                p.sendRawMessage("§8You are in the §l§bBlue §8team!");
            }
            if (online.size() == 1) {
                enoughplayers();
            }
 
        }
    }
 
    public void enoughplayers() {
        if (!Bukkit.getScheduler().isQueued(start)) {
            Bukkit.broadcastMessage("§6Enough players online. Starting in 10 seconds");
            start = Bukkit.getScheduler().scheduleSyncRepeatingTask(this,
                    new Runnable() {
 
                        @Override
                        public void run() {
                            if (number != -1) {
                                if (number != 0) {
                                    Bukkit.broadcastMessage("§6" + number);
                                    for (Player p : Bukkit.getOnlinePlayers()) {
                                        p.playSound(p.getLocation(),
                                                Sound.ANVIL_LAND, 1, 1);
                                    }
                                    number--;
                                } else {
                                    timer();
                                    startsound();
                                    Bukkit.broadcastMessage("§6Game Started. You have 20 minutes.");
                                    Bukkit.broadcastMessage("§cRemember this is a teaming game so don't kill your team with tnt or it will result a ban!");
                                    for (Player p : Bukkit.getOnlinePlayers()) {
                                        p.getInventory().addItem(tnt);
                                        p.getInventory().addItem(tnt);
                                        p.getInventory().addItem(tnt);
                                        p.getInventory().addItem(tnt);
                                        p.getInventory().addItem(redstone);
                                        p.getInventory().addItem(redstone);
                                        p.getInventory().addItem(button);
                                        p.getInventory().addItem(brick);
                                        p.getInventory().addItem(brick);
                                        p.getInventory().addItem(brick);
                                        p.getInventory().addItem(water);
                                        p.getInventory().addItem(repeater);
                                        p.getInventory().addItem(redtorch);
                                        p.getInventory().addItem(slab);
 
                                    }
                                    for (String str : red) {
                                        Player red = Bukkit.getPlayer(str);
                                        getConfig().options()
                                                .copyDefaults(true);
                                        saveConfig();
                                        int x1 = getConfig().getInt("x1");
                                        int y1 = getConfig().getInt("y1");
                                        int z1 = getConfig().getInt("z1");
                                        org.bukkit.World world = red.getWorld();
                                        red.teleport(new Location(world, x1,
                                                y1, z1));
                                    }
                                    for (String str : blue) {
                                        Player blue = Bukkit.getPlayer(str);
                                        getConfig().options()
                                                .copyDefaults(true);
                                        saveConfig();
                                        int x2 = getConfig().getInt("x2");
                                        int y2 = getConfig().getInt("y2");
                                        int z2 = getConfig().getInt("z2");
                                        org.bukkit.World world = blue
                                                .getWorld();
                                        blue.teleport(new Location(world, x2,
                                                y2, z2));
                                    }
                                    starttimer = true;
 
                                    number--;
 
                                }
                            }
 
                        }
 
                    }, 0, 20);
 
        }
    }
 
    public void timer() {
        timer = Bukkit.getScheduler().scheduleSyncRepeatingTask(this,
                new Runnable() {
 
                    @Override
                    public void run() {
                        if (startgame != -1) {
                            if (startgame != 0) {
                                startgame--;
                            } else {
                                startgame--;
                                Bukkit.broadcastMessage("§6Time is up nobody has won. Good luck next time!");
                                ending();
                                for (String str : red) {
                                    Player redE = Bukkit.getPlayer(str);
                                    red.remove(redE);
                                }
                                for (String str : blue) {
                                    Player blueE = Bukkit.getPlayer(str);
                                    blue.remove(blueE);
                                    for (Player p : Bukkit.getOnlinePlayers()) {
                                        p.getInventory().clear();
                                    }
 
                                }
                            }
 
                        }
                        if (startgame == 900) {
                            Bukkit.broadcastMessage("§615 minutes left!");
                        }
                        if (startgame == 600) {
                            Bukkit.broadcastMessage("§610 minutes left!");
                        }
                        if (startgame == 300) {
                            Bukkit.broadcastMessage("§65 minutes left!");
                        }
 
                    }
 
                }, 0, 20);
 
    }
 
    public void ending() {
        for (Player p : Bukkit.getOnlinePlayers()) {
            p.getInventory().clear();
        }
        Bukkit.broadcastMessage("ending");
        end2 = Bukkit.getScheduler().scheduleSyncDelayedTask(this,
                new Runnable() {
 
                    @Override
                    public void run() {
                        for (Player p : Bukkit.getOnlinePlayers()) {
                            p.kickPlayer("The Game has ended!");
                            canceltask();
                        }
 
                        for (String str1 : red) {
                            Player redE = Bukkit.getPlayer(str1);
                            red.remove(redE);
                        }
                        for (String str : blue) {
                            Player blueE = Bukkit.getPlayer(str);
                            blue.remove(blueE);
 
                        }
                    }
 
                }, 200);
 
    }
 
    public boolean onCommand(CommandSender sender, Command cmd, String label,
            String[] args) {
 
        // The following section is for declaring all the necessary variables.
        Player player = (Player) sender;
        getConfig().options().copyDefaults(true);
        saveConfig();
        if (cmd.getName().equalsIgnoreCase("setred")) {
            getConfig().set("x1", player.getLocation().getBlockX());
            getConfig().set("y1", player.getLocation().getBlockY());
            getConfig().set("z1", player.getLocation().getBlockZ());
            saveConfig();
            player.sendMessage("§cRed spawn set!");
 
        }
        if (cmd.getName().equalsIgnoreCase("setblue")) {
            getConfig().set("x2", player.getLocation().getBlockX());
            getConfig().set("y2", player.getLocation().getBlockY());
            getConfig().set("z2", player.getLocation().getBlockZ());
            saveConfig();
            player.sendMessage("§1Blue spawn set!");
 
        }
        if (cmd.getName().equalsIgnoreCase("setlobby")) {
            getConfig().set("xlobby", player.getLocation().getBlockX());
            getConfig().set("ylobby", player.getLocation().getBlockY());
            getConfig().set("zlobby", player.getLocation().getBlockZ());
            saveConfig();
            player.sendMessage("§6Lobby spawn set!");
 
        }
        if (cmd.getName().equalsIgnoreCase("time")) {
            Player p = (Player) sender;
            if (starttimer) {
                p.sendRawMessage("§6The TnTWars game has §c" + startgame
                        + " seconds §6Left");
            } else {
                p.sendRawMessage("§cThe game hasn't started yet!");
            }
        }
        return false;
    }
 
    @EventHandler
    public void onleave(PlayerQuitEvent e) {
        spec.remove(e.getPlayer().getName());
        e.getPlayer().getInventory().clear();
        online.remove(e.getPlayer().getName());
        e.setQuitMessage(null);
        if (starttimer) {
            if (red.contains(e.getPlayer().getName())) {
                red.remove(e.getPlayer().getName());
                Bukkit.broadcastMessage(e.getPlayer().getName()
                        + " §6Has died. Team §cRed §6" + red.size() + "§6/6");
            }
            if (blue.contains(e.getPlayer().getName())) {
                blue.remove(e.getPlayer().getName());
                Bukkit.broadcastMessage(e.getPlayer().getName()
                        + " §6Has died. Team §bBlue §6" + blue.size() + "§6/6");
            }
            if (red.size() == 0) {
                Bukkit.broadcastMessage("§6Team §1Blue §6has won!!!");
                Bukkit.broadcastMessage("§cYou will be kicked in 10 seconds");
                starttimer = false;
                ending();
            } else {
                if (blue.size() == 0) {
                    Bukkit.broadcastMessage("§6Team §cRed §6has won!!!");
                    Bukkit.broadcastMessage("§cYou will be kicked in 10 seconds");
                    ending();
                    starttimer = false;
                }
 
            }
        }
    }
 
    @EventHandler
    public void ondeath(PlayerRespawnEvent e) {
        spec.add(e.getPlayer().getName());
        online.remove(e.getPlayer().getName());
        for (String str1 : online) {
            for (String str : spec) {
                Player ingame = Bukkit.getPlayer(str1);
                Player spec = Bukkit.getPlayer(str);
                ingame.hidePlayer(spec);
            }
        }
        if (starttimer) {
            if (red.contains(e.getPlayer().getName())) {
                red.remove(e.getPlayer().getName());
                Bukkit.broadcastMessage(e.getPlayer().getName()
                        + " §6Has died. Team §cRed §6" + red.size() + "§6/6");
            }
            if (blue.contains(e.getPlayer().getName())) {
                blue.remove(e.getPlayer().getName());
                Bukkit.broadcastMessage(e.getPlayer().getName()
                        + " §6Has died. Team §bBlue §6" + blue.size() + "§6/6");
            }
            if (red.size() == 0) {
                Bukkit.broadcastMessage("§6Team §bBlue §6has won!!!");
                Bukkit.broadcastMessage("§cYou will be kicked in 10 seconds");
                ending();
                starttimer = false;
            } else {
                if (blue.size() == 0) {
                    Bukkit.broadcastMessage("§6Team §cRed §6has won!!!");
                    Bukkit.broadcastMessage("§cYou will be kicked in 10 seconds");
                    ending();
                    starttimer = false;
                }
 
            }
        }
    }
 
    public void canceltask() {
        Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
 
            @Override
            public void run() {
                Bukkit.getScheduler().cancelTask(timer);
                Bukkit.getScheduler().cancelTask(start);
                number = 10;
                startgame = 1200;
                rollback("world");
                }
 
        }, 10);
 
    }
 
    @EventHandler
    public void ondeathmessage(PlayerDeathEvent e) {
        e.setDeathMessage(null);
        e.getDrops().clear();
    }
 
    public void startsound() {
        for (Player p : Bukkit.getOnlinePlayers()) {
            p.playSound(p.getLocation(), Sound.NOTE_PLING, 1, 1);
        }
    }
 
    @EventHandler
    public void ondrop(PlayerDropItemEvent e) {
        e.setCancelled(true);
    }
    //Unloading maps, to rollback maps. Will delete all player builds until last server save
    public static void unloadMap(String world){
        if(Bukkit.getServer().unloadWorld(Bukkit.getServer().getWorld(world), false)){
              Bukkit.broadcastMessage("Successfully unloaded " + world);
        }else{
            Bukkit.broadcastMessage("COULD NOT UNLOAD " + world);
        }
    }
    //Loading maps (MUST BE CALLED AFTER UNLOAD MAPS TO FINISH THE ROLLBACK PROCESS)
    public static void loadMap(String world){
        World w = Bukkit.getServer().createWorld(new WorldCreator(world));
        w.setAutoSave(false);
        Bukkit.getServer().createWorld(new WorldCreator(world));
        Bukkit.broadcastMessage("Successfully loaded " + world);
    }
 
    //Maprollback method, because were too lazy to type 2 lines
    public static void rollback(String world){
        unloadMap(world);
        loadMap(world);
    }
}
// add a spectator spawn

Does anyone have a Idea to rollback a map?