[Q] Problem with flashing Bootbundle

[uniextra]

hi i flashed with Flashtools the last FTF 4.4.4 but i have to force exclude Bootbundle from the flash since it creashes the flash proceess.

Bootbundle includes:
userdata.sin
boot_delivery.xml
cache.sin
loader.sin
app_log.sin

the problem seems to be on app_log.sin since all other flashed ok!

24/057/2014 19:57:40 - INFO - Going to flash boot delivery
24/057/2014 19:57:40 - INFO - Processing emmc_appsboot_S1_Boot_Lagan_1.1.1_1_HWID_7190E1_OE M0.sin
24/057/2014 19:57:40 - INFO - Checking header
24/057/2014 19:57:40 - ERROR - Processing of emmc_appsboot_S1_Boot_Lagan_1.1.1_1_HWID_7190E1_OE M0.sin finished with errors.
24/057/2014 19:57:40 - INFO - Ending flash session
24/057/2014 19:57:40 - ERROR - ERR_SEVERITY="MINOR";ERR_CODE="0017";ERR_DYNAMIC=" 0x80080021 ";

i don't know if i have a locked or unlocked bootloader... might that be the cause?
Anyway, what does app_log.sin do?