The category module settings there is a setting titled "BuyNow Page Name". If the category module is on the same page as the buynow module then you can leave this field blank. If you add the category module to a page that does not have the buynow module on it then you must enter the page name that has the buynow module. This tells the categories module which page to navigate to when the user clicks a category.

Btw, the mini cart module works similarly.

-Scott

You're suppose to enter the "Page Name" from your dnn page settings, there shouldn't be an aspx on the end.

-Scott