Load Level

Hey guys i need some help...Why this won't work?
Code:

PHP:

public function onEnable(){
$this->lobbyconfig = new config($this->getDataFolder() . "config.yml", Config::YAML, array());
        $this->getServer()->loadLevel($this->lobbyconfig->get("lobby_spawn_world"));
}

"conig.yml"

Code:

---
loby_spawn_world: "McKaff"
lobby_spawn_x: 134.400000
lobby_spawn_y: 4.000000
lobby_spawn_z: 124.600000
...

ERROR:_

Code:

[08:43:52] [Server thread/CRITICAL]: pocketmine\utils\LevelException: "Invalid empty level name" (EXCEPTION) in "/src/pocketmine/Server__32bit" at line 1057

Level WorldName is McKaff

Thx

Check the config ... You write "loby" you load "lobby" xD there a mistake

Thx