I checked your site, and the entire htdocs folder of your site is missing.
As you can see in the Domains page in the client area, the directory for facemash.66ghz.com is supposed to be facemash.66ghz.com/htdocs.
But if you check your file manager, you’ll see there is no directory facemash.66ghz.com there at all.
To fix this simply create the missing directory. So in the main folder of the account (the one that currently only contains the htdocs directory), create a folder facemash.66ghz.com. And within that folder, create a folder htdocs. Then, upload your files to that new htdocs folder.
The same goes for the other subdomain on your account too. You can just delete the current htdocs folder if you want, no domain name is linked to it anymore so it’s useless.