Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in C:\AppServ\www\greenhess-storage\vendor\psr\log\Psr\Log\NullLogger.php:13 Stack trace: #0 {main} thrown in C:\AppServ\www\greenhess-storage\vendor\psr\log\Psr\Log\NullLogger.php on line 13