Fatal error: Uncaught Error: Class "Monolog\Handler\AbstractProcessingHandler" not found in C:\laragon\www\xibo\vendor\xibosignage\support\src\Xibo\Support\Monolog\Handler\RocketChatHandler.php:13 Stack trace: #0 {main} thrown in C:\laragon\www\xibo\vendor\xibosignage\support\src\Xibo\Support\Monolog\Handler\RocketChatHandler.php on line 13