FOOTWEAR SIZE LISTING

Hi, recently i get this issue on providing information on footwear size.

We enter correctly everything from the dropdown provided by amazon flatfile (and also edit page), and it still shows this error “The field ‘size_system’ for the attribute ‘[footwear_size]’ does not have enough values. The required minimum is ‘1’ value(s).”

We put in the value as instructed and yet it keeps shows this error despite exactly entering the value (from the drop down).

Anyone has this issue?