添加產品的時候，系統提示無法操作：
“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頁面輸UPC想查找產品，但什么都沒有；用關鍵詞定位，還是什么都沒有。這是哪里出問題了么？