Sony Ericsson ST15i flashin error I found nothing about

[Jahsehah]

Long story short, I had some reasons to flash ST15i in past but had never seen this error before.
Log looks like that:

30/011/2018 02:11:11 - INFO - Selected Bundle for SonyEricson Xperia Mini(ST15i). FW release : 4.1.B.0.587. Customization : Unbranded
30/011/2018 02:11:11 - INFO - Preparing files for flashing
30/011/2018 02:11:27 - INFO - Please connect your device into flashmode.
30/011/2018 02:11:33 - INFO - Using Gordon gate drivers version 3.1.0.0
30/011/2018 02:11:33 - INFO - Opening device for R/W
30/011/2018 02:11:34 - INFO - Device ready for R/W.
30/011/2018 02:11:34 - INFO - Reading device information
30/011/2018 02:11:34 - INFO - Phone ready for flashmode operations.
30/011/2018 02:11:34 - INFO - Opening TA partition 2
30/011/2018 02:11:34 - INFO - Current device : ST15i - BX902U4NMR - 1248-9812_R3I - 1244-2098_4.1.B.0.587 - WORLD-i_4.1.B.0.587
30/011/2018 02:11:34 - INFO - Closing TA partition
30/011/2018 02:11:35 - INFO - Start Flashing
30/011/2018 02:11:35 - INFO - Ending flash session
30/011/2018 02:11:35 - ERROR - Not a sin file
30/011/2018 02:11:35 - ERROR - Error flashing. Aborted

I use the latest version of flashtool, because previous one cannot sync with github what gives me additional errors.
My question is what does that "Not a sin file" error mean and what causes it (except for my inability to see some obvious things).
Thanks in advance.

 

[NadavCE]

Long story short, I had some reasons to flash ST15i in past but had never seen this error before.
Log looks like that:

<snip>

I use the latest version of flashtool, because previous one cannot sync with github what gives me additional errors.
My question is what does that "Not a sin file" error mean and what causes it (except for my inability to see some obvious things).
Thanks in advance.

Did you manage to solve this? Running into the same issue with my ST18i...

 

[Jahsehah]

Did you manage to solve this? Running into the same issue with my ST18i...

Nope, I still havent.