Please let the site owner... not the hosting service... know you experienced this difficulty? If you go to the root URL, you should get a sensible result, and on that page, or one linked to it, a way to reach the site owner.
This error sometimes arises when you try to click on a link in an email... and the link has been split across two lines by the email software. There are various ways to get around the problem. One is to simply add, by hand, the missing bit to the part that "the system" did manage to transfer to your browser... e.g. Firefox.