The error indicates that mandatory data is missing from your Amazon feed. They may include brand, size, length, width, height, type, color, or style and vary depending on what you are selling. Item attribute requirements apply to all new and revised listings, so you have to provide valid values for all mandatory attributes.
To find the attributes for a specific product, open the product details card and find the Attributes section on the General tab. You can specify the Custom attribute value or use the attributes for this product from your store.
Finally, save your changes, and the app will re-launch the List/Revise action.
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