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