Fatal error: Uncaught Error: Interface 'Gloudemans\Shoppingcart\Contracts\InstanceIdentifier' not found in /var/www/html/spaceagent/micadolayout/vendor/bumbummen99/shoppingcart/tests/Fixtures/Identifiable.php:7 Stack trace: #0 {main} thrown in /var/www/html/spaceagent/micadolayout/vendor/bumbummen99/shoppingcart/tests/Fixtures/Identifiable.php on line 7