Whoever told you that was on drugs.
I don't know the specific conditions needed to fully complete a drive cycle for our cars but it sounds like you still need to drive it in a specific way in order for the evap system and o2 to complete their portion of the drive cycle. However, that should not cause a communication error. I would go back tomorrow to try again and see if you get a better reader or you completed the cycle by then. That would be my next step as far as troubleshooting goes if you don't have an obd2 scanner.
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