Have you read that message carefully ? It contains everything you needed to understand what you did wrong:
Your new screenshots shows the message says that your GSX Serial Number doesn't seems to be a correct number for "Fsdreamteam O'Hare"!!!
It means you are trying to activate O'Hare, using your GSX Serial Number so, it's fairly normal that a GSX Serial Number would be invalid for O'Hare. If you want to activate GSX, you must select GSX for the activation, before pressing the "Register Serial" button!