Fatal error: Uncaught Error: Class "Illuminate\Notifications\Notification" not found in C:\xampp\htdocs\new_saas\backend\app\Notifications\CampaignCompletedNotification.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\new_saas\backend\app\Notifications\CampaignCompletedNotification.php on line 10