Something just went wrong with our server. It's not your fault.
The best thing you can do is to simply try the same thing again; perhaps the problem was a one-time fluke.
If that doesn't work, wait about an hour and then try again. Most likely our ISP will have corrected the problem by then.
If that doesn't work, please contact me and describe what you are trying to do when the problem occurs. If that message gets through, I'll at least know that I need to contact the ISP and prod them to correct the problem.