This implies that you have a blank line of code or error on line 9 of Connections/ProductsDb.php. Can I see a copy of that page?
The cart is empty because you have the quantity set to get the value from a form element named: eCart1_1_Quantity_Add and that form element isn't on the page. You could set that value to 1 in the add to cart interface and it should start adding the selected items to the cart.