Fatal error: Uncaught Error: Class "Symfony\Component\CssSelector\Node\AbstractNode" not found in /home/wwwarms/ws.arms-tools.com/websocket-server/vendor/symfony/css-selector/Node/FunctionNode.php:26 Stack trace: #0 {main} thrown in /home/wwwarms/ws.arms-tools.com/websocket-server/vendor/symfony/css-selector/Node/FunctionNode.php on line 26