Checkout button not showing

-- url of the page with the problem -- : luxordiamond.com/products-listing/
-- HikaShop version -- : 2.2.2
-- Joomla version -- : 3.1
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : chrome
-- Error-message(debug-mod must be tuned on) -- : Error_message
luxordiamond.com/products-listing/checkout.html

Hi,

Some details on your problem can be a good idea.