The error message you are encountering—"Product group does not contain any visible products"—is occurring because the currency was changed from USD to NGN. To resolve the error, we recommend switching the currency back to USD.
We understand your preference for paying in Naira, and we want to assure you that you can still complete your purchase in Naira. Simply select "Naira" as your Payment Method on the "Checkout" page, and you will be able to make the payment in your preferred currency.