Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Extension\Extension' not found in C:\xampp\htdocs\plugins\Symfony\Component\DependencyInjection\Extension\AbstractExtension.php:25 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\DependencyInjection\Extension\AbstractExtension.php on line 25