Directory listings and categories not showing.

Hi.

I have installed the directory plugin at

http://www.eurogoldsales.com

If you have a look at the home page you will see categories and sub categories, however when you click on a category from the home page you get this error message

Sorry, we can't find the content you're looking for at this URL. Please try selecting a menu item from above or to the side of this message to get where you'd like to go.

I have also added a listing which also can not be accessed. You should be able to see it here

http://www.eurogoldsales.com/listings/jaggards/

Please help.

Thanks