Fatal error: Uncaught Error: Class 'Symfony\Component\CssSelector\XPath\Extension\AbstractExtension' not found in C:\Apache24\htdocs\vendor.old\symfony\css-selector\XPath\Extension\HtmlExtension.php:29 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\vendor.old\symfony\css-selector\XPath\Extension\HtmlExtension.php on line 29