what is the problem in this code?

what is the problem in this code?

PHP:

<?php
namespace MadeUpadanaYT\ItemProfil;

use pocketmine\Server;
use pocketmine\item\Item;
use pocketmine\item\NetherStar;
use pocketmine\Player;
use pocketmine\inventory\Inventory;
use pocketmine\item\enchantment\Enchantment;
use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\event\Listener;
use pocketmine\plugin\PluginBase;
use onebone\economyapi\EconomyAPI;

class main extends PluginBase implements Listener{

public function onEnable(){
    $this->getLogger()->info("Plugin Sudah Myala");
}
public function onDisable(){
    $this->getLogger()->info("Plugin Sudah Mati");
}

public function onCommand(CommandSender $sender, Command $cmd, $label, array $args){
if($cmd->getName() == "oo"){
        if($sender instanceof Player){
        $money = EconomyAPI::getInstance()->myMoney($sender);
               $inv = $sender->getInventory();
        $i = Item::get(399,0,1);
            $i->setCustomName("§r§eMoney: {$money}");
            $inv->addItem($i);
    }
        if($sender instanceof Player){
        $player = $event->getPlayer();
               $inv = $sender->getInventory();
        $i = Item::get(399,0,1);
             $i->setCustomName("§r§bName: {$player}");
             $inv->addItem($i);
    }
    return true;
  }
}
}

when used will crash like this

Notice: Undefined variable: event in /storage/emulated/0/Genisys/plugins/a/src/MadeUpadanaYT/ItemProfil/main.php on line 35
[02:19:00] [Server thread/CRITICAL]: Unhandled exception executing command 'oo' in oo: Call to a member function getPlayer() on unknown
[02:19:00] [Server thread/CRITICAL]: Error: "Call to a member function getPlayer() on unknown" (EXCEPTION) in "/a/src/MadeUpadanaYT/ItemProfil/main" at line 35

 

Use the [PHP] [/PHP] tags. They're there for a reason.

 

Can you fix this code?