Bootloader is not unlocking

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http://forum.xda-developers.com – Hi! I want to unlock by bootloader.. Got my code from Sony Mobile unlocking website.. Starting in fastboot mode then in cmd I type this " fastboot.exe -i 0x0fce getvar version" then Enter I got the value 0.3 i.e it is connected:D Now second step " fastboot.exe -i 0x0fce oem unlock 0x My KEY" then I press enter... Now it shows unlocking failed:eek: what is the problem anybody knows??? And also my Bootloader status says " bootloader unlock allowed - YES;) Sent from my LT15i using xda premium (HowTos)