Failed on Install Plugbox Linux with kernel in NAND memory

Hi Jeff,
I am newbie and try to install Plugbox in NAND of PogoPlug V2(Pink) by following the following instructions:

http://plugapps.com/index.php5/Install_Plugbox_Linux_with_kernel_in_NAND_memory

But after I reboot the system I can never get back to the system by SSH. I used serial cable to monitor the system and I got:

U-Boot 2010.09 (Feb 16 2011 - 18:43:36)
UBIT v0.6 by Jeff Doozan and Peter Carmichael

SoC:   Kirkwood 88F6281_A0
DRAM:  256 MiB
NAND:  128 MiB
In:    serial
Out:   serial
Err:   serial
Net:   egiga0
88E1116 Initialized on egiga0
Creating 1 MTD partitions on "nand0":
0x000002500000-0x000008000000 : "mtd=3"
UBI: attaching mtd1 to ubi0
UBI: physical eraseblock size:   131072 bytes (128 KiB)
UBI: logical eraseblock size:    129024 bytes
UBI: smallest flash I/O unit:    2048
UBI: sub-page size:              512
UBI: VID header offset:          512 (aligned 512)
UBI: data offset:                2048
UBI: attached mtd1 to ubi0
UBI: MTD device name:            "mtd=3"
UBI: MTD device size:            91 MiB
UBI: number of good PEBs:        721
UBI: number of bad PEBs:         7
UBI: max. allowed volumes:       128
UBI: wear-leveling threshold:    4096
UBI: number of internal volumes: 1
UBI: number of user volumes:     0
UBI: available PEBs:             710
UBI: total number of reserved PEBs: 11
UBI: number of PEBs reserved for bad PEB handling: 7
UBI: max/mean erase counter: 1/1
UBIFS error (pid 0): ubifs_get_sb: cannot open "ubi:silent", error -19
Error reading superblock on volume 'ubi:silent'!
UBIFS not mounted, use ubifs mount to mount volume first!
Using egiga0 device
ping failed; host 10.10.10.5 is not alive
(Re)start USB...
USB:   Register 10011 NbrPorts 1
USB EHCI 1.00
scanning bus for devices... 3 USB Device(s) found
       scanning bus for storage devices... 1 Storage Device(s) found
Hit any key to stop autoboot:  0
UBIFS error (pid 0): ubifs_get_sb: cannot open "ubi:fast", error -19
Error reading superblock on volume 'ubi:fast'!
UBIFS not mounted, use ubifs mount to mount volume first!
Loading file "/boot/uImage" from usb device 0:1 (usbda1)
** File not found /boot/uImage
Loading file "/uInitrd" from usb device 0:1 (usbda1)
** File not found /uInitrd
reading /boot/uImage

** Unable to read "/boot/uImage" from usb 0:1 **
reading /uInitrd

** Unable to read "/uInitrd" from usb 0:1 **
** Block device usb 1 not supported
** Block device usb 1 not supported

** Invalid boot device **

** Invalid boot device **
** Block device usb 2 not supported
** Block device usb 2 not supported

** Invalid boot device **

** Invalid boot device **
** Block device usb 3 not supported
** Block device usb 3 not supported

** Invalid boot device **

** Invalid boot device **
Unknown command 'ide' - try 'help'
** Block device ide 0 not supported
** Block device ide 0 not supported

** Invalid boot device **

** Invalid boot device **
** Block device ide 1 not supported
** Block device ide 1 not supported

** Invalid boot device **

** Invalid boot device **
UBIFS error (pid 0): ubifs_get_sb: cannot open "ubi:ramdisk", error -19
Error reading superblock on volume 'ubi:ramdisk'!
UBIFS not mounted, use ubifs mount to mount volume first!

NAND read: device 0 offset 0x480000, size 0x80000
 524288 bytes read: OK
## Starting application at 0x00800200 ...

Then it just stuck on "Starting application at ...."
One line said: UBIFS not mounted, use ubifs mount to mount volume first!
I guess I should first mount a usb drive or and how...?

I am totally lost and donot know what to do. Please help!!

Thanks a lot!

zhaozh