Why is my 'checkout' page coming up with '404 Not Found' for my shopify site?

[wildandcokids]

Why is my 'checkout' page coming up with '404 Not Found' for my shopify site?

When i add items to cart and then click "checkout" it comes up with error message.

It was working yesterday so not sure what i have done to make this error?

Site not live yet.

https://j4yzrq04dnptuufj-70243287074.shopifypreview.com 

www.wildandcokids.com 

[YOD_Solutions]

I think it is because it is a preview. Checkout is not available on previews. Have you tested it in your main store (not the preview)?