Fatal error: Call to undefined method shopFunctions

[piedequeso]

I this fatal error when clicking on a product listed on the products virtuemart module:

This is the error: Fatal error: Call to undefined method shopFunctionsF::PdfIcon() in /home/content/12/8993712/html/templates/gk_yourshop/html/com_virtuemart/productdetails/default.php on line 71

here is the url: americafood.org