htc one m7 error:cannot load unlock code.bin

[rasheem]

hello all,i need help here.am trying to unlock the bootloader of Htc one m7 sprint following a tutorial, but i got stuck with this error:
unknown partition'unlocktoken_code.bin
error:cannot determine image filename for 'unlocktoken_code.bin
i make sure i followed the instruction correctly.very file is placed in same folder in the C:/ drive