Fatal error: Uncaught Error: Interface "Gloudemans\Shoppingcart\Contracts\Buyable" not found in /home/sirajgan/public_html/vendor/olimortimer/laravelshoppingcart/tests/Fixtures/BuyableProduct.php:7 Stack trace: #0 {main} thrown in /home/sirajgan/public_html/vendor/olimortimer/laravelshoppingcart/tests/Fixtures/BuyableProduct.php on line 7