Fatal error: Uncaught Error: Class 'Symfony\Component\CssSelector\XPath\Extension\AbstractExtension' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\css-selector\XPath\Extension\CombinationExtension.php:26 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\css-selector\XPath\Extension\CombinationExtension.php on line 26