Something behind the scenes isn`t working quite right. There`re a variety of things that can cause you to see this error, but it`s our fault, not yours. Often this is a temporary glitch that will be fixed within a few seconds or minutes.
We`ve been sent an email detailing the problem. If it`s not something we can fix immediately, you can be sure it`s been put on the high priority list and we`ll be getting to it shortly.