I am trying to schedule a function with: PHP: $this->api->schedule(10*1200, array($this, "purgePlayers()"), array(), true); But I get the following error: 29.10 06:49:54 [Server] ERROR A level 4096 error happened: "Argument 2 passed to PocketMinecraftServer::schedule() must be callable, array given, called in /jar/pocketmine.php(32) : eval()'d code on line 47 and defined" in "/jar/pocketmine.php(32) : eval()'d code" at line 21 What's wrong?