SQL bug

[sSlotty]

[04:19:56] [Server thread/CRITICAL]: Error: "Call to undefined method pocketmine\Server::getScheduler()" (EXCEPTION) in "plugins/ServerAuth/src/ServerAuth/Providers/MySQLProvider" at line 81
[04:19:56] [Server thread/DEBUG]: #0 plugins/ServerAuth/src/ServerAuth/ServerAuth(241): ServerAuth\Providers\MySQLProvider->init()
[04:19:56] [Server thread/DEBUG]: #1 src/pocketmine/plugin/PluginBase(123): ServerAuth\ServerAuth->onEnable()
[04:19:56] [Server thread/DEBUG]: #2 src/pocketmine/plugin/PluginManager(587): pocketmine\plugin\PluginBase->setEnabled(boolean 1)
[04:19:56] [Server thread/DEBUG]: #3 src/pocketmine/Server(1984): pocketmine\plugin\PluginManager->enablePlugin(ServerAuth\ServerAuth object)
[04:19:56] [Server thread/DEBUG]: #4 src/pocketmine/Server(1970): pocketmine\Server->enablePlugin(ServerAuth\ServerAuth object)
[04:19:56] [Server thread/DEBUG]: #5 plugins/PocketMine-DevTools.phar/src/DevTools/DevTools(51): pocketmine\Server->enablePlugins(integer 0)
[04:19:56] [Server thread/DEBUG]: #6 src/pocketmine/plugin/PluginBase(123): DevTools\DevTools->onEnable()
[04:19:56] [Server thread/DEBUG]: #7 src/pocketmine/plugin/PluginManager(587): pocketmine\plugin\PluginBase->setEnabled(boolean 1)
[04:19:56] [Server thread/DEBUG]: #8 src/pocketmine/Server(1984): pocketmine\plugin\PluginManager->enablePlugin(DevTools\DevTools object)
[04:19:56] [Server thread/DEBUG]: #9 src/pocketmine/Server(1970): pocketmine\Server->enablePlugin(DevTools\DevTools object)
[04:19:56] [Server thread/DEBUG]: #10 src/pocketmine/Server(1703): pocketmine\Server->enablePlugins(integer 0)
[04:19:56] [Server thread/DEBUG]: #11 src/pocketmine/PocketMine(250): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string C:\Users\Oatwant\Desktop\mcpe, string C:\Users\Oatwant\Desktop\mcpe\plugins)
[04:19:56] [Server thread/DEBUG]: #12 (1): require(string phar://C:/Users/Oatwant/Desktop/mcpe/PocketMine-MP.phar/src/pocketmine/PocketMine.php)