error :-ubuntu on beagleboard-xm

Texas Instruments X-Loader 1.4.4ss (Jan  4 2011 - 12:38:07)
Beagle xM Rev A
Reading boot sector
Loading u-boot.bin from mmc


U-Boot 2010.03 (Feb 20 2011 - 20:15:58)

OMAP3630/3730-GP ES2.0, CPU-OPP2, L3-165MHz,
OMAP3 Beagle board + LPDDR/NAND
I2C:   ready
DRAM:  512 MB
NAND:  0 MiB
*** Warning - bad CRC or NAND, using default environment

In:    serial
Out:   serial
Err:   serial

Probing for expansion boards, if none are connected you'll see a harmless I2C error.

No EEPROM on expansion board
Beagle xM Rev A
Die ID #437a00011ff00000015739eb0c01701a
Hit any key to stop autoboot:  0
mmc1 is available
The user button is currently NOT pressed.
reading boot.scr

437 bytes read
Running bootscript from mmc ...
## Executing script at 80200000
mmc1 is available
reading uImage

64 bytes read
reading uInitrd

64 bytes read
Wrong Image Format for bootm command
ERROR: can't get kernel image!
OMAP3 beagleboard.org #