[Plugin: WP e-Commerce] Fatal error/undefined function-shopping cart

My e-commerce shopping cart and checkout worked fine until I downloaded WP 3.0.

Now at checkout this error message displays:

Fatal error: Call to undefined function wpsc_has_shipping_form() in /home1/laplayab/public_html/wp-content/uploads/wpsc/themes/default/shopping_cart_page.php on line 91

I have deactivated/reactivated, reinstalled e-commerce. Still received error message.

Any ideas are appreciated.

Kalapattar
laplayabooks.com