Fatal error: Uncaught Error: Interface 'Masterminds\HTML5\Serializer\RulesInterface' not found in /var/www/typo3/vendor/masterminds/html5/src/HTML5/Serializer/OutputRules.php:17 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/masterminds/html5/src/HTML5/Serializer/OutputRules.php on line 17