opencart excel数据导入导出插件（不会删除原数据）

darrenv

export出来的xls文件打开有问题：
<b>Notice</b>: Error: Unknown column 'cg.name' in 'field list'<br />Error No: 1054<br />SELECT ps.*, cg.name FROM `oc_product_special` ps LEFT JOIN `oc_customer_group` cg ON cg.customer_group_id=ps.customer_group_id ORDER BY ps.product_id, cg.name in <b>/home/wwwroot/mo/system/database/mysql.php</b> on line <b>49</b>