SalePrice must be a positive value. For more details, see http://sellercentral.amazon.co.uk/gp/help/24901
This error occurs when the SalePrice value in your inventory file or price feed is invalid.
To be valid, your SalePrice value must be:
To resolve this error, please resubmit your data using a positive SalePrice value that is less than the item-price or StandardPrice.