ubiattach error!

[jerry]

hi all,
I am trying to use ubi to attach mtd3(3.9G),but there are some
question.the mlc is SAMSUNG K9LBG080D,the kernel version is 2.6.28
# flash_erase  /dev/mtd3;

# ubiattach /dev/ubi_ctrl -m 3
UBI: attaching mtd3 to ubi0
UBI: physical eraseblock size:   524288 bytes (512 KiB)
UBI: logical eraseblock size:    516096 bytes
UBI: smallest flash I/O unit:    4096
UBI: VID header offset:          4096 (aligned 4096)
UBI: data offset:                8192
UBI: empty MTD device detected
UBI: create volume table (copy #1)
UBI: create volume table (copy #2)
UBI: attached mtd3 to ubi0
UBI: MTD device name:            "Filesys partition"
UBI: MTD device size:            4078 MiB
UBI: number of good PEBs:        8156
UBI: number of bad PEBs:         0
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:             8071
UBI: total number of reserved PEBs: 85
UBI: number of PEBs reserved for bad PEB handling: 81
UBI: max/mean erase counter: 0/0
UBI: background thread "ubi_bgt0d" started, PID 452
UBI device number 0, total 8156 LEBs (fae48000 bytes, 3.9 GiB),
available 8071 LEBs (f8472000 bytes, 3.9 GiB), LEB size 7e000 bytes
(504.0 KiB)

# ubimkvol /dev/ubi0 -n 0 -N uu -s 100MiB;
Volume ID 0, size 204 LEBs (105283584 bytes, 100.4 MiB), LEB size
516096 bytes (504.0 KiB), dynamic, name "uu", alignment 1

# ubidetach /dev/ubi_ctrl -m 3
UBI: mtd3 is detached from ubi0

# ubiattach /dev/ubi_ctrl -m 3
UBI: attaching mtd3 to ubi0
UBI: physical eraseblock size:   524288 bytes (512 KiB)
UBI: logical eraseblock size:    516096 bytes
UBI: smallest flash I/O unit:    4096
UBI: VID header offset:          4096 (aligned 4096)
UBI: data offset:                8192
UBI error: ubi_scan_add_used: two LEBs with same sequence number 4
ubiattach: error!: cannot attach mtd3
          error 22 (Invalid argument)

Thanks.

Best Regards,
Jerry