must be of type pocketmine\player\GameMode

Hey
I'm in the process of adapting one of my plugins to pocketmine 4.0, but I get this error message:
[Server thread/CRITICAL]: TypeError: "pocketmine\player\Player::setGamemode(): Argument #1 ($gm) must be of type pocketmine\player\GameMode, int given, called in C:\Users\----\Desktop\PocketMine\plugins\GameMode\src\gamemode\main.php on line 33" (EXCEPTION) in "pmsrc/src/player/Player" at line 1049
I'm new to 4.0 so i dont know anything about it.
- GeistFan

 

PHP:

<?php

use pocketmine\player\Player;
use pocketmine\player\GameMode;


/**
*@var $player Player
*/
$player->setGamemode(GameMode::SURVIVAL())


All Method in GameMode Class

PHP:

/**
 * This doc-block is generated automatically, do not modify it manually.
 * This must be regenerated whenever registry members are added, removed or changed.
 * @see build/generate-registry-annotations.php
 * @generate-registry-docblock
 *
 * @method static GameMode ADVENTURE()
 * @method static GameMode CREATIVE()
 * @method static GameMode SPECTATOR()
 * @method static GameMode SURVIVAL()
 */

 

Thanks!!