Fatal error: Uncaught Error: Class "Sabberworm\CSS\RuleSet\RuleSet" not found in /users/danielstruebig/www/firma/vendor/sabberworm/php-css-parser/src/RuleSet/AtRuleSet.php:14 Stack trace: #0 {main} thrown in /users/danielstruebig/www/firma/vendor/sabberworm/php-css-parser/src/RuleSet/AtRuleSet.php on line 14