BeagleBoard Rev C4/C5 Reflashing Procedure HELP (newbie here)

Hi there,

Ive been following the steps given in this site to reflash the NAND on my C5 board following the instructions on this site.

It keeps saying wrong image format for ‘source’ command and unable to read ‘boot.scr’ from mmc .Ive attached the log file. how can i flash my NAND and get to the last step which is to get into the linux desktop. Someone please help. Thanks