Why doesn't the button to opencart work?

Question

opencart

Good afternoon,
here is the site
088.cafe
The button add to cart does not work in the console error
jquery-2.1.1.min.js:4 POST 088.cafe/ajax.php?do=addcart 404 (Not Found)
The button works only in the recommended module , it's on the main page - where is delicious pizza .. but there is still an error in the console.

Answer 1

because there is no such ajax.php page.