Fatal error: Uncaught Error: Class 'Symfony\Component\CssSelector\Node\AbstractNode' not found in /home/app/htdocs/message_gateway/vendor/symfony/css-selector/Node/FunctionNode.php:26 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/symfony/css-selector/Node/FunctionNode.php on line 26