i9500 unlock problem 4.3 rooted

Hi i am new in Octopus Box



while i try to unlock samsung i9500 give the error below



Selected port: COM11

Selected model: GT-I9500

Proper android device not found. Make shure that "USB debug" option

on the device is turned on.

Phone unlocking failed



But usb debug is already on

please how to solve this

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