亚马逊后台添加产品的时候，一直出现错误提示信息

添加产品的时候，系统提示无法操作：
“We have identified potential matches for the product you are listing. Before attempting to list, please search the Amazon.com catalog first to see if you can find an already existing listing. If your product does not yet exist and needs to be listed with a new ASIN, please contact Seller Support.”
我在catalog页面输UPC想查找产品，但什么都没有；用关键词定位，还是什么都没有。这是哪里出问题了么？