Fatal error: Uncaught Error: Class "Symfony\Component\CssSelector\Node\AbstractNode" not found in D:\Apache24\www\sanqi\back-end\vendor\symfony\css-selector\Node\SelectorNode.php:24 Stack trace: #0 {main} thrown in D:\Apache24\www\sanqi\back-end\vendor\symfony\css-selector\Node\SelectorNode.php on line 24