I made a plugin called KygekJoinUI. The plugin is located in here. I was submitting the Dev #12 build, but it got rejected. I thought maybe it got rejected because there is a minor lint. The lint is: PHPStan Problem found in Kygekraqmak/KygekJoinUI/Main.php at line 55. : Call to an undefined method pocketmine\plugin\Plugin::createSimpleForm() I looked at line 55 and it's when the plugin called the FormAPI. Yes, this plugin is dependent with FormAPI. Anyone can help?