Install Angstrom

Hello everyone, I'm using BeagleBoard-xM,
I wanna install Angstrom. So, I dit what http://elinux.org/BeagleBoardBeginners
said.
But, the final step, when I boot at the fist time, via Console, I got
the message:
U-Boot SPL 2011.12-00010-ga3eb89c (Jan 29 2012 - 14:53:43)
Texas Instruments Revision detection unimplemented
OMAP SD/MMC: 0
timed out in wait_for_bb: I2C_STAT=1000
reading u-boot.img
spl: error reading image u-boot.img, err - -1
### ERROR ### Please RESET the board ###
How can I fix it.
Thank you so much.

have you tried re-imaging the micro-sd card?