Fatal error: Uncaught Error: Interface 'Sabberworm\CSS\Property\AtRule' not found in C:\xampp\htdocs\reservation\vendor\sabberworm\php-css-parser\src\Property\Charset.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\reservation\vendor\sabberworm\php-css-parser\src\Property\Charset.php on line 16