Set a command executor.

Hi, I'm having a small mistake in a plugin.
I'm trying to set a custom executor, but it doesn't work...

My main class OnEnable:

PHP:

 public function OnEnable()
    {
        $this->getServer()->getPluginManager()->registerEvents(new EvListener($this),$this);
        @mkdir($this->getDataFolder());
        @mkdir($this->getDataFolder() . "players/");

        $command = new PluginCommand("mc",$this);
        $command->setExecutor(new Mc($this));
        $this->getServer()->getCommandMap()->register("mc",$command);

        $this->saveResource("settings.yml");
        $this->saveResource("groups.yml");
        $this->getLogger()->info(TextFormat::GREEN . "MagicChat " . MagicChat::VERSION . " by @AndrewBit4 enabled.");

        if($this->getConf("Broadcaster")[0]){
            $this->getServer()->getScheduler()->scheduleRepeatingTask(new Broadcaster($this),$this->getConf("Broadcaster")[1] * 20);
        }
        if($this->getConf("Popup")[0]){
            $this->getServer()->getScheduler()->scheduleRepeatingTask(new PopupTask($this),$this->getConf("Popup")[1] * 20);
        }
    }

My command executor:

PHP:

<?php

namespace andrew\Commands;

use pocketmine\command\Command;
use pocketmine\command\CommandExecutor;
use pocketmine\command\CommandSender;
use pocketmine\Player;

use andrew\MagicChat;

class Mc implements CommandExecutor {

    private $plugin;

    public function __construct(MagicChat $plugin){
        $this->plugin = $plugin;
    }

    public function onCommand(CommandSender $sender, Command $cmd, $label, array $args) {
        $fcmd = $cmd->getName();
        if(strtolower($fcmd) === "mc"){
            $sender->sendMessage("Mc works!");
        }
    }
}
?>

Plugin yaml:

PHP:

name: MagicChat
main: andrew\MagicChat
version: "0.1"
api: [1.12.0]
author: AndrewBit4
description: Manage your chat like never before!
website: http://twitter.com/AndrewBit4
commands:
mc:
  aliases: [magicchat]
  description: Magic chat commands.
  default: op


What happens when you execute the command?

Nothing, it doesn't send any message...

Not even command not exist? That's odd. Does a new command exist in /help?

Is there any errors on load? Any errors at all? More info would be better crashes in the background when you execute the command

Plugin.yml: missing space after before mc:

Oh wait. You are registering twice. either register it in plugin.yml then use $this->getCommand() to get the instance, or just delete the registering in plugin.yml and setup the data in code entirely.