For me at least, I received the exact same screen. All I did was go back and read the instructions. (Highly under-rated bit of text, very helpful) I had the right ones, my CF card was fine, I removed the memory cards, but I hadn't done a hard reset after. Another time I got a different error, with the Hentges rom, but only because I had named the wrong files to initrd.bin and zImage. That may or may not be the case, but I suspect it is.