Price Calculation Not Working after Upgrade to 2.0.20

I just upgraded the woocommerce to latest version 2.0.20 and realized the pricing no longer working in the cart.

The error is “Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘addPriceSuffix’ not found or invalid function name in /users3/domains/gaellehome.com/web/wp-includes/plugin.php on line 199”.

Could someone pls advise what is wrong?

Many thanks in advance.

http://wordpress.org/plugins/woocommerce/