Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in I:\www\frameworks\Symfony\doctrine\vendor\psr\log\Psr\Log\NullLogger.php:13 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\psr\log\Psr\Log\NullLogger.php on line 13