Fatal error: Uncaught Error: Interface 'Sabberworm\CSS\Renderable' not found in /home/aefn/public_html/moodle/lib/php-css-parser/RuleSet/RuleSet.php:15 Stack trace: #0 {main} thrown in /home/aefn/public_html/moodle/lib/php-css-parser/RuleSet/RuleSet.php on line 15