[Plugin: WooCommerce – excelling eCommerce] Woocommerce Error

Hi there, i just updated my woocommerce but now when i got to my shop page i get this error

Fatal error: Call to a member function is_visible() on a non-object in /home/lephenix/public_html/3gsscreens.co.uk/wp-content/plugins/woocommerce/templates/loop-shop.php on line 24

this is on my all products page and when i try to see any of my products i get a 404 page.

Thanks

ed

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