Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Queue\ShouldBeUnique" not found in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/vendor/illuminate/contracts/Queue/ShouldBeUniqueUntilProcessing.php:5 Stack trace: #0 {main} thrown in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/vendor/illuminate/contracts/Queue/ShouldBeUniqueUntilProcessing.php on line 5