보고 명령어로 작성해 봤는데, 'An internal error occurred while attempting to perform this command' 라고 뜨네요. 위에 있는 걸로도 해봐도 변화가 없고 어떻게 해야 하나요??

public class ResetCommand implements CommandExecutor {

private Hardcore plugin;

public ResetCommand(Hardcore plugin) {

this.plugin = plugin;

}

@Override

public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {

Player p = (Player) sender;

FileConfiguration config = plugin.getConfig();

World worldtp = Bukkit.getWorld(config.getString("Spawn.World"));

double x = config.getDouble("Spawn.X");

double y = config.getDouble("Spawn.Y");

double z = config.getDouble("Spawn.Z");

float yaw = (float) config.getDouble("Spawn.Yaw");

float pitch = (float) config.getDouble("Spawn.Pitch");

Location location = new Location(worldtp, x, y, z, yaw, pitch);

World world = p.getWorld(); // The world you want to reset

for(Player player : Bukkit.getOnlinePlayers()){

player.teleport(location);

}

String worldName = world.getName(); // The world name

if (!Bukkit.unloadWorld(world, false)) return false;

File worldFolder = new File(plugin.getDataFolder().getParentFile().getParentFile(), worldName); // World folder

worldFolder.delete(); // Delete world folder

Bukkit.createWorld(new WorldCreator(worldName)); // Create the world

return false;

}

}

'An internal error occurred while attempting to perform this command' 는 명령어 실행시 오류나면 어디서든 띄워주는 오류 메세지구요, 아래에 내용을 알려주셔야 뭐라도 해결해볼거같네요