how to fix problem related to odin for flashing android?

i am trying to flash my mobile samsung galaxy s7562 with odin 3.12 . when connect mobile in download mode to pc with cble . it shows that my mobile is added . i tried AP and select the firmware that i had download and start. But it proceed till file analysis. i waited for about 40 minutes many times . but cant install that firmware
and firmware which i have download is official and is of my country and of my mobile's os

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