When Codeware is installed, you can use this function without issues. Otherwise, you may need to get [GameInstance] through other functions like [GameObject.GetGame] for example.
This function will only work when the game engine is initialized, meaning a [GameInstance] do exists.
Use this function to write in logs, along with [FTLogWarning] and [FTLogError].
See wiki for more about logging.
See [FTLog] instead.