Error 32

Hello.

I'm making a backup from my friendly arm 2440 to my PC with an USB wire.
But all the time i have this error. Anybody can help me?

This is my error:

Use dnw.exe to receive backup.
=============== USB Backup Start ==============
Send Flash Backush Backup: [            p: [                               
                                  0]                      0]
     erasesize : 128KB
     oobblock  : 2048
     oobsize   : 64
     ecctype   : 0x2
     eccsize   : 256
Backup Information:
     Start Addr       : 0x0
     End Addr         : 0x8000000
     bBackupOOB       : 1
     bCheckBad        : 1
     dwBackupTotalLen : 0x8400000
     dwReservedBlks   : 0
     dwEPInPktSize    : 32
dnw.exe read data 65536 bytes a time, has to read 2112 times
Send Flash Backup: [                                                  1]
Send Flash Backup: [=                                                 2]
Send Flash Backup: [=                                                 3]
Send Flash Backup: [==                                                4]
Send Flash Backup: [==                                                5]
Send Flash Backup: [===                                               6]
Send Flash Backup: [===                                               7]
Send Flash Backup: [====                                              8]
Send Flash Backup: [====                                              9]
Send Flash Backup: [=====                                             10]
Send Flash Backup: [=====                                             11]
Send Flash Backup: [======                                            12]
Send Flash Backup: [======                                            13]
Send Flash Backup: [=======                                           14]
Send Flash Backup: [=======                                           15]
Send Flash Backup: [========                                          16]
Send Flash Backup: [========                                          17]
Send Flash Backup: [=========                                         18]
Send Flash Backup: [=========                                         19]
Send Flash Backup: [==========                                        20]
Error: rxCnt = 2112, success = 0, rxLength = 65536, nBytesRead = 0, err =
0x1f
=============== USB Backup Failed err:31 ============

Canceled by HOST!
Backup End: (393KB/S, 71S)

My OS is Windows XP SP2 and download address port is 0x30000000

I'm getting the same error... 



Enter your selection: u
Backup Information:
     Start Addr       : 0x0
     End Addr         : 0x10000000
     bBackupOOB       : 1
     bCheckBad        : 1
     dwBackupTotalLen : 0x10800000
     dwReservedBlks   : 28
     dwEPInPktSize    : 32
Use dnw.exe to receive backup.
=============== USB Backup Start ==============
Send FlaNand Flash Information:
     type      : 0x4
     type      : 0x4
     flags     : 0xc5
     flags     : 0xc5

     size      : 256MB

     size      : 256MB
     erasesize : 128KB
     oobblock  : 2048
     oobsize   : 64
     ecctype   : 0x2
     eccsize   : 256
Backup Information:
     Start Addr       : 0x0
     End Addr         : 0x10000000
     bBackupOOB       : 1
     bCheckBad        : 1
     dwBackupTotalLen : 0x10800000
     dwReservedBlks   : 28
     dwEPInPktSize    : 32
dnw.exe read data 65536 bytes a time, has to read 4224 times
Send Flash Backup: [                                                  1]
Error: rxCnt = 4224, success = 0, rxLength = 65536, nBytesRead = 0, err =
0x1f
=============== USB Backup Failed err:31 ============

Canceled by HOST!
Backup End: (150KB/S, 23S)


Anyone knows what it means?