Fatal error: Uncaught Error: Class "TYPO3\HtmlSanitizer\Visitor\AbstractVisitor" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/html-sanitizer/src/Visitor/CommonVisitor.php:34 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/html-sanitizer/src/Visitor/CommonVisitor.php on line 34