If I am understanding correctly, the message you get is, "You logged in from another location"?
You only get this when your account is being used on either another device, or it is compromised.
You could try relaunching the game, uninstalling it, reinstalling it, but I'm sure you've already tried doing that. Best thing to do now would probably be to contact mojang, I don't think it is a problem on Minehut's end.