Add to Cart Button & MORE INFO

i just upgraded my Kallyas Theme, WooCommerce and WordPress, and everything appears to be working just fine. However the presentation of the ADD to CART button is now just text.
If you go to any page that has a payment or deposit link on it, all that I am now presented with is “Add to Cart” Text then MORE INFO.

Here is a link to the page
https://imagesinafricasafaris.com/photography-workshop-032016/

Currently I am using the following shortcode to get the button on the page
[add_to_cart id=”3318″ show_price=”false” style=”padding 10px”]

Further I have attempted to use my existing functions.php file but when I use that I get the following error message.

Fatal error: Call to undefined function zget_option() in /home3/gavins6/public_html/imagesinafrica.com/wp-content/themes/kallyas/woocommerce/zn-woocommerce-init.php on line 35

Any ideas and or suggestions would be most welcome.