Fatal error: Uncaught Error: Class "Sabberworm\CSS\RuleSet\RuleSet" not found in /srv/www/htdocs/moodle/lib/php-css-parser/RuleSet/DeclarationBlock.php:26 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/php-css-parser/RuleSet/DeclarationBlock.php on line 26