Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Extension\Extension' not found in E:\xampp\htdocs\vendor\symfony\http-kernel\Tests\Fixtures\ExtensionPresentBundle\DependencyInjection\ExtensionPresentExtension.php:17 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\symfony\http-kernel\Tests\Fixtures\ExtensionPresentBundle\DependencyInjection\ExtensionPresentExtension.php on line 17