function 'woocommerce_template_single_description' not found

I am using YIT Quick View with the North theme. When I click on a Quick View button on the products page I get this error message in the product description of the pop-up;
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'woocommerce_template_single_description' not found or invalid function name in /xxxx/xxxx/xxxx/wp-includes/plugin.php on line 496

You can try it here;
http://www.vangovapes.com/product-category/fruit-blends/

Any help would be appreciated;
Ray

https://ww.wp.xz.cn/plugins/yith-woocommerce-quick-view/