If I were you, I would start fresh, format card on PC, restore CANON factory settings, then try newest nightly and update firmware again just to be sure, but that part should be fine since its clearly loading your autoexec.bin file. But you need to run firmware update anyway to make card boot once formatted.
But see how that works first.
Because I am from US, tried exactly what you did while NTSC, then saw you use PAL, so I tried PAL, I cant get it to do that error, or any error.