Fatal error: Uncaught Error: Class "SellingPartnerApi\Response" not found in D:\www\vendor\jlevers\selling-partner-api\src\Seller\SupplySourcesV20200701\Responses\GetSupplySourcesResponse.php:16 Stack trace: #0 {main} thrown in D:\www\vendor\jlevers\selling-partner-api\src\Seller\SupplySourcesV20200701\Responses\GetSupplySourcesResponse.php on line 16