Fatal error: Uncaught Error: Undefined constant "SERVER_ROOT" in C:\xampp\htdocs\yxs.sciensources.com\chain\Backend\Seller\FixSelling\FixSellingModel.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\yxs.sciensources.com\chain\Backend\Seller\FixSelling\FixSellingModel.php on line 3