Why is MangaGo no letting me in?

'We are sorry the request file are not found.' This is the message I get. I'm trying to use a VPN and even switching countries on the vpn. I gave it a few days and tried again only to get the same message. Why is it doing this to me? Edit: so I've got a new issue when I turn off the VPN and try getting in. It now tells me the website isn't secure so I can't get in.