Bootloader unlock problem

[googerdi]

I want to unlock bootloader and I get error :

C:\adb>fastboot oem get_unlock_data
...
(bootloader) Unlock data:
(bootloader) read datablock error
(bootloader) Failed
OKAY [  0.013s]
finished. total time: 0.016s

When I use "getvar all" I get
(bootloader) cid: 0xDEAD