CAT_VALIDATION_ERROR_GENDER_INVALID is raised when gender is not FEMALE, MALE, or UNISEX. Localized translations and 'kids' are not accepted for this enum.
Snap Catalog Manager's product schema has format and value rules per attribute. This issue is typically: missing a required attribute for the category, an invalid enum value (e.g., 'XL' submitted where 'M, L, XL' is the valid set), out-of-range numbers, or attributes that conflict across the feed.