Fatal error: Uncaught Error: Class "Wikimedia\CSS\Sanitizer\FontFaceAtRuleSanitizer" not found in C:\xampp\htdocs\extensions\TemplateStyles\includes\TemplateStylesFontFaceAtRuleSanitizer.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\TemplateStyles\includes\TemplateStylesFontFaceAtRuleSanitizer.php on line 21