wp e-commerce page not found

Hi everybody,

I don’t know why the “checkout”, “enter-details” , “transaction-results” pages, don’t show up on the site, the URL options are set rigth.

My site is https://www.morartesania.com/product-page/

https://www.morartesania.com/checkout/

I use: WP 2.1 and Wp-ecommerce 3.5 RC6

I set permalink: /%year%/%monthnum%/%day%/%postname%/

If anybody can help me I would be very gratefull.