Fatal error: Uncaught Error: Class "Symfony\Component\CssSelector\XPath\Extension\AbstractExtension" not found in D:\Apache24\www\qilu\back-end\vendor\symfony\css-selector\XPath\Extension\PseudoClassExtension.php:27 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu\back-end\vendor\symfony\css-selector\XPath\Extension\PseudoClassExtension.php on line 27