add to cart is 'undefined'

At this site

www.anderson-ergo.ca/joomla I seem unable to add items to the cart. The cart shows 'undefined' when you add an item. This is a simple site with products in the main menu.

It used to work but stopped. Is there a place I can look for php error logs to see what is happening.

Thanks

Dave

Hi,

I just tried on your website and it's working fine. Do you still have the problem on your end ?