Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\monolog-bundle\DependencyInjection\MonologExtension.php:42 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\monolog-bundle\DependencyInjection\MonologExtension.php on line 42