Fatal error: Uncaught Error: Class "Model" not found in C:\xampp\htdocs\yxs.sciensources.com\chain\Wechat\Seller\Purchasing\PurchasingModel.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\yxs.sciensources.com\chain\Wechat\Seller\Purchasing\PurchasingModel.php on line 3