Plugin command required namespace to run.

Hi I am new to plugin development and am working on my first plugin. I want to have one command which is the main command and it will have sub commands. I also want to create all my commands dynamically. My problem is I have a command /igvote with the aliases /v and /vote. /v and /vote work perfectly however /igvote doesn't run unless you run /igvote:igvote how can I go about fixing this? I tried adding igvote to the aliases list which didn't work.

Main Plugin File:

Code:

public class IGVoting extends JavaPlugin {
   
    @Override
    public void onEnable() {
        registerCommands();
    }
   

    @Override
    public void onDisable() {

    }

    private void registerCommands() {
       
        CommandHandler handler = new CommandHandler();
        handler.register("help", new Help());   
       
        register("igvote", handler);
    }
   
    private void register(String fallback, BukkitCommand command) {
        try {
            Field bukkitCommandMap = Bukkit.getServer().getClass().getDeclaredField("commandMap");
            bukkitCommandMap.setAccessible(true);
            CommandMap commandMap = (CommandMap) bukkitCommandMap.get(Bukkit.getServer());
            commandMap.register(fallback, command);
        } catch (IllegalAccessException | IllegalArgumentException | NoSuchFieldException | SecurityException e) {
            e.printStackTrace();
        }
    }
}

CommandHandler:

Code:

public class CommandHandler extends BukkitCommand {
   
    private static HashMap<String, CommandInterface> commands = new HashMap<String, CommandInterface>();
   
    public CommandHandler() {
        super("igvote");
        this.setAliases(Arrays.asList("v", "vote"));
        this.setDescription("Main command for InGameVoting.");
        this.setUsage("Type /igvote help for information on commands.");
        this.setPermission("igvote.use");
    }

    @Override
    public boolean execute(CommandSender sender, String label, String[] args) {
        if (sender instanceof Player) {
            if (args.length == 0) {
                sender.sendMessage("Type /igvote help for information on commands.");
                return true;
            }
           
            if (args.length > 0) {
                if (exists(args[0].toLowerCase())) {
                    this.getExecutor(args[0].toLowerCase()).execute(sender, label, args);
                    return true;
                } else {
                    sender.sendMessage("This command doesn't exist!");
                    return true;
                }
            }
        } else {
            sender.sendMessage(ChatColor.RED + "You must be a player to use this command.");
            return true;
        }
       
        return false;
    }
   
    public void register(String name, CommandInterface cmd) {
        commands.put(name.toLowerCase(), cmd);
    }
   
    public boolean exists(String name) {
        return commands.containsKey(name);
    }
   
    public CommandInterface getExecutor(String name) {
        return commands.get(name);
    }

}