[Q] help please with return to stock

I have a sony xperia D5803 i want to return back to stock, I downloaded the sony flash tool and put the firmware in the firmware section, i got all of the stuff from this site http://ift.tt/1sZMs6N.

but this is the error i get when i try to flash the phone:

29/012/2016 12:12:34 - INFO - Selected Bundle for Sony Xperia Z3 Compact (D5803). FW release : 23.4.A.1.264. Customization : IT
29/012/2016 12:12:34 - INFO - Preparing files for flashing
29/013/2016 12:13:13 - INFO - Please connect your device into flashmode.
29/013/2016 12:13:13 - INFO - Opening device for R/W
29/013/2016 12:13:13 - INFO - Start Flashing
29/013/2016 12:13:13 - INFO - Processing loader.sin
29/013/2016 12:13:13 - INFO - Checking header
29/013/2016 12:13:13 - ERROR - Processing of loader.sin finished with errors.
29/013/2016 12:13:13 - INFO - Ending flash session
29/013/2016 12:13:13 - ERROR -
29/013/2016 12:13:13 - ERROR - Error flashing. Aborted
29/013/2016 12:13:14 - ERROR - Drivers need to be installed for connected device.
29/013/2016 12:13:14 - ERROR - You can find them in the drivers folder of Flashtool.

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