Fatal error: Uncaught Error: Interface 'Illuminate\Contracts\Queue\ShouldQueue' not found in /Users/caiosilva/Sites/Laravel-test/vendor/laravel/framework/src/Illuminate/Notifications/SendQueuedNotifications.php:14 Stack trace: #0 {main} thrown in /Users/caiosilva/Sites/Laravel-test/vendor/laravel/framework/src/Illuminate/Notifications/SendQueuedNotifications.php on line 14