Fatal error: Uncaught Error: Class "MediaWiki\SpecialPage\SpecialPage" not found in C:\xampp\htdocs\extensions\Gadgets\includes\Special\SpecialGadgets.php:42 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\Gadgets\includes\Special\SpecialGadgets.php on line 42