在已有商品中添加新变体，上传报错90008

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上传新变体出现错误 代码90008 请求如何解决。

The file's header row is missing or invalid. The header row is for Amazon use only and must not be modified or deleted. To correct this error, download the template again from seller Help and use that new copy, or insert the correct header row directly above the column headings in your existing file.