Fatal error: Uncaught Error: Interface "Masterminds\HTML5\Serializer\RulesInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/html-sanitizer/src/Serializer/RulesInterface.php:22 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/html-sanitizer/src/Serializer/RulesInterface.php on line 22