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