This is a nice friendly error page. You don't want to see all the garbage that might have been displayed here and make you cranky. Instead, you get this page.
Don't worry, though. An email has been sent to the admin and hopefully they can figure out what went wrong so you don't see this page again anytime soon.
That said, if you would like to provide more details or get a direct response to when this will be fixed, please use the Report A Problem