Problems Flash tool topic

Good first sorry for the English evil, I to have a problem I already released the bootloader and caught again, today I want to unlock again so that is giving this:

14/055/2013 22:55:31 - INFO - Device connected in fastboot mode
14/055/2013 22:55:36 - INFO - Unlocking phone using key XXXXXXXXXXXXXXXXXX
14/055/2013 22:55:36 - INFO - ...
14/055/2013 22:55:36 - INFO - FAILED (remote: Command did not succeed)
14/055/2013 22:55:36 - INFO - finished. Total time: 0.035s

XXXXXXXXXXXXXXXXXX = the unlock code i got from Sony


Someone help me with this problem?