Fatal error: Uncaught Error: Class "MediaWiki\HTMLForm\OOUIHTMLForm" not found in C:\xampp\htdocs\extensions\OATHAuth\src\HTMLForm\OATHAuthOOUIHTMLForm.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\OATHAuth\src\HTMLForm\OATHAuthOOUIHTMLForm.php on line 18