Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\http-kernel\DependencyInjection\MergeExtensionConfigurationPass.php:22 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\http-kernel\DependencyInjection\MergeExtensionConfigurationPass.php on line 22