Fatal error: Uncaught Error: Class "Monolog\Handler\AbstractProcessingHandler" not found in C:\laragon\www\newProject.SymfonyUser\vendor\symfony\monolog-bridge\Handler\MailerHandler.php:29 Stack trace: #0 {main} thrown in C:\laragon\www\newProject.SymfonyUser\vendor\symfony\monolog-bridge\Handler\MailerHandler.php on line 29