Mufflies

Yes, I've tried that as well. Still saying the page does not exist

So I've been getting this for a while, and I don't know how it is solved or what. I've searched for possible answers but I haven't been able to find anything. So when I go to the 'Cart' link on the marketplace website, it goes straight to a page that says "the page you are looking for does not exist" and I can't complete my purchase to get my items. I've tried refreshing, I've went back to the shopping page then back to cart, and nothing ever changes. Could anyone help?