Can't unlock bootloader

I cant unlock bootloader of my asus zenfone 5z using the unloacker app. its showing unknown error everytime I try to unlock. @CH_ASUS @Kris_ASUS please help
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I cant unlock bootloader of my asus zenfone 5z using the unloacker app. its showing unknown error everytime I try to unlock. @CH_ASUS @Kris_ASUS please help
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@CH_ASUS Please help
Hi
Did you unlock it once before ?
Yes I did
Please help me with unlocking it again