Fatal error: Uncaught Error: Class 'Symfony\Component\CssSelector\XPath\Extension\AbstractExtension' not found in /home/app/htdocs/message_gateway/vendor/symfony/css-selector/XPath/Extension/HtmlExtension.php:29 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/symfony/css-selector/XPath/Extension/HtmlExtension.php on line 29