Fatal error: Uncaught Error: Interface "Sabberworm\CSS\Property\AtRule" not found in /users/danielstruebig/www/firma/vendor/sabberworm/php-css-parser/src/Property/Charset.php:17 Stack trace: #0 {main} thrown in /users/danielstruebig/www/firma/vendor/sabberworm/php-css-parser/src/Property/Charset.php on line 17