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Looks like i am not the only one with the same error.
http://developer.sonymobile.com/2014/12/12/how-to-unlock-the-boot-loader-of-an-xperia-device-video/
Since no one was able to find solution so i was trying tons of things and finally i figured it out by myself.:smileysmileythumbsup:
Here is what i did, i used another computer.:smileytongue:
Ok so I think there were two reasons why it keeps getting errors: 1) either my high end pc wasn't supported or 2) it required same pc from which i had previously unlocked the bootloader.:smileyhappy: