Fatal error: Uncaught Error: Class "Osp\Base\OspStub" not found in C:\xampp\htdocs\tmall\src\vipapis\product\ImprovedVendorProductService.php:29 Stack trace: #0 {main} thrown in C:\xampp\htdocs\tmall\src\vipapis\product\ImprovedVendorProductService.php on line 29