I can't update my internal FLASH memory through UART (OMAP-L138 LCDK)

I try to to flash my development board OMAP-L138 LCDK with my DSP project. I follow intructions from http://processors.wiki.ti.com/index.php/OMAPL138_StarterWare_Booting_And_Flashing but I've got a failure:

>sfh_OMAP-L138.exe -flash_noubl boot.bin -targetType OMAPL138_LCDK -flashType NAND -p COM41
-----------------------------------------------------
   TI Serial Flasher Host Program for OMAP-L138
   (C) 2011, Texas Instruments, Inc.
   Ver. 1.67
-----------------------------------------------------


    [TYPE] Single boot image
    [BOOT IMAGE] boot.bin
    [TARGET] OMAPL138_LCDK
    [DEVICE] NAND
    [NAND Block] 1

Attempting to connect to device COM41...
Press any key to end this program at any time.

(AIS Parse): Read magic word 0x41504954.
(AIS Parse): Waiting for BOOTME... (power on or reset target now)
(AIS Parse): BOOTME received!
(AIS Parse): Performing Start-Word Sync...
(AIS Parse): Performing Ping Opcode Sync...
(AIS Parse): Processing command 0: 0x58535901.
(AIS Parse): Performing Opcode Sync...
(AIS Parse): Loading section...
(AIS Parse): Loaded 13500-Byte section to address 0x80000000.
(AIS Parse): Processing command 1: 0x58535901.
(AIS Parse): Performing Opcode Sync...
(AIS Parse): Loading section...
(AIS Parse): Loaded 1440-Byte section to address 0x800034BC.
(AIS Parse): Processing command 2: 0x58535906.
(AIS Parse): Performing Opcode Sync...
(AIS Parse): Performing jump and close...
(AIS Parse): AIS complete. Jump to address 0x80000000.
(AIS Parse): Waiting for DONE...
(AIS Parse): Boot completed successfully.

Waiting for SFT on the OMAP-L138...
File boot.bin is not present.


Interfacing to the OMAP-L138 via UART failed.
Please reset or power-cycle the board and try again...

What is wrong?