Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Queue\ShouldBeUnique" not found in /home/deborapsol/laravel/vendor/laravel/framework/src/Illuminate/Contracts/Queue/ShouldBeUniqueUntilProcessing.php:5 Stack trace: #0 {main} thrown in /home/deborapsol/laravel/vendor/laravel/framework/src/Illuminate/Contracts/Queue/ShouldBeUniqueUntilProcessing.php on line 5