Fatal error: Uncaught Error: Class "Sabberworm\CSS\RuleSet\RuleSet" not found in /srv/www/htdocs/moodle/lib/php-css-parser/RuleSet/AtRuleSet.php:11 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/php-css-parser/RuleSet/AtRuleSet.php on line 11