Fatal error: Uncaught Error: Class "Illuminate\Notifications\Notification" not found in /var/www/html/mylaravel/vendor/laravel/horizon/src/Notifications/LongWaitDetected.php:12 Stack trace: #0 {main} thrown in /var/www/html/mylaravel/vendor/laravel/horizon/src/Notifications/LongWaitDetected.php on line 12