Error that i can't understand

i followed this tutorial https://forums.pmmp.io/threads/plugin-command-v2.9320/#post-70597
and here is my code:

PHP:

class GetUUID extends Command implements PluginIdentifiableCommand{

    /**
     * @var Plugin
     */

        public function __construct(string $name, Plugin $plugin, string $description = "", ?string $usageMessage = null, array $aliases = []){
            parent::__construct($name, $description, $usageMessage, $aliases);
            $this->plugin = $plugin;
            $this->setDescription("Get a player's UUID");
        }

        public function execute(CommandSender $sender, string $commandLabel, array $args){
           
        }

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


but it gives me this error

Code:

Fatal error: Declaration of mmm545\UUIDBan\Commands\GetUUID::getPlugin(): mmm545\UUIDBan\Commands\Plugin must be compatible with pocketmine\command\PluginIdentifiableCommand::getPlugin(): pocketmine\plugin\Plugin in C:\Users\hehe\Desktop\pocketmine\plugins\UUID Ban\src\mmm545\UUIDBan\Commands\GetUUID.php on line 13

i feel it's a stupid mistake

 

You are missing a use statement for pocketmine\plugin\Plugin

 

thx