AGameModeBase::StartPlay() Error- error C2653: 'AReviseGameModeBase': is not a class or namespace name

Yea, get rid of the namespace stuff. Your original problem is probably from the mixing of the class name AReviseGameMode and AReviseGameModeBase

Make sure you use the same name you used when declaring the class in the header.
In this case AReviseGameMode, NOT AReviseGameModeBase.

HTH

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