Keystore was tampered with, or password was incorrect

Here in detail what I did: I published my Android game on play store. The keystore was created in the same unity project folder. I took backup of the unity project on same computer but on different drive(copied and pasted on the other drive). I made some changes in the game and when i tried to export signed apk, unity gave me this error: Keystore was tampered with, or password was incorrect

After spending some time on internet I just got an idea that this has happened because I created duplicate keystore on the same PC.

I did not get any solution for this. Please help me gusy, I want to update my game ASAP. Thank you !!