If you open Freebitco.in an incognito tab, you'll access the website, it loads without a problem, every page works well but when you enter your credentials and login, then you'll see the error that's shown on the image.
Btw I suddenly forgot my password and tried to recover it but Freebitco didn't send me a recovery email. I think that Freebitco isn't hacked, they have server configuration problems or some problems in the website's script. They've been trying to fix issues and maybe they messed up something during that moment.