Solved Command not work

My code is it:

PHP:

<?php

namespace NovaCore\Commands;

use NovaCore\Core\NCCore;
use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\command\PluginIdentifiableCommand;
use pocketmine\plugin\Plugin;
use pocketmine\utils\TextFormat;
use pocketmine\Player;
use pocketmine\utils\Config;
use NovaCore\Player\PlayerData;

class RegisterCommand extends Command implements PluginIdentifiableCommand{

    /** @var  NCCore $plugin */
    private $plugin;

    public function __construct(NCCore $plugin){
        parent::__construct("register", "Register in NovaCraft PE");
        $this->plugin = $plugin;
    }

    public function execute(CommandSender $sender, string $commandLabel, array $args) : bool
    {
        if ($sender instanceof Player) {
            $users = new Config($this->plugin->getDataFolder() . "users.yml", Config::YAML);

            /** @var PlayerData $pd */
            $pd = $this->plugin->players[strtolower($sender->getName())];
            if (!$users->exists($sender)) {
                if(!isset($args[0])){
                    return true;
                }
                if (!$pd->isAuthed()) {
                    $sender->sendMessage(TextFormat::DARK_AQUA . "Te has registrado correctamente!");
                    $users->set($sender->getName(), $args[0]);
                    $users->save();
                    $sender->removeAllEffects();
                    $pd->setAuthed(true);
                } else {
                    $sender->sendMessage(TextFormat::DARK_RED . "No es necesario volver a iniciar secion");
                }
                /**} else {
                 * $sender->sendMessage(TextFormat::DARK_RED . "Ya te has registrado, porfavor inicia secion");
                 * }
                 * } else {
                 * $sender->sendMessage(TextFormat::DARK_RED . "Ejecuta este comando en el juego");
                 * }*/
            }
        }
        return false;
    }

    public function getPlugin() : Plugin{
        return $this->plugin;
    }
}



Error in console:
[12:13:00] [Server thread/CRITICAL]: Unhandled exception executing command 'register xd' in register: Illegal offset type in isset or empty
[12:13:00] [Server thread/CRITICAL]: ErrorException: "Illegal offset type in isset or empty" (EXCEPTION) in "src/pocketmine/utils/Config" at line 421

 

PHP:

#you are using a config in yaml i don't think "exists()" is the good function
#replace if(!$users->exists($sender)) by
if(!$users->get($sender)) 
#maybe $sender->getName() will be good


i think that can work.

 

Loool XD thanks guys

 

now work thanks!

 

But that work Not a problem

 

So you're creating a Config every time the command is ran?