Fatal error: Uncaught Error: Class "RtfHtmlPhp\Element" not found in /usr/local/www/roundcube/vendor/roundcube/rtf-html-php/src/ControlSymbol.php:5 Stack trace: #0 {main} thrown in /usr/local/www/roundcube/vendor/roundcube/rtf-html-php/src/ControlSymbol.php on line 5