Fatal error: Uncaught Error: Interface "Sabberworm\CSS\CSSElement" not found in C:\xampp\htdocs\vendor\sabberworm\php-css-parser\src\RuleSet\RuleSet.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\sabberworm\php-css-parser\src\RuleSet\RuleSet.php on line 26