Fatal error: Uncaught Error: Class "Symfony\Component\CssSelector\XPath\Extension\AbstractExtension" not found in C:\wamp64\houda\vendor\symfony\css-selector\XPath\Extension\RelationExtension.php:26 Stack trace: #0 {main} thrown in C:\wamp64\houda\vendor\symfony\css-selector\XPath\Extension\RelationExtension.php on line 26