[Q] Flashing stock rom error - Moto g topic

Please help, i tried to install cyanogenmod 12 in my moto g, but because of and error with the ui stopping working i tried to back up, to find that i couldn't because of this error:

(bootloader) Preflash validation failed
FAILED (remote failure)

This happend when trying to flash gpt.bin and motoboot.bin, everything else flashed fine.
If someone out there could help me fix this problem i will be very thankfull.
Thanks.

(sorry for my bad inglish, im not an inglish speaker)