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Battery Collector Tutorial problems : Invalid BlueprintType enum base

I am following the battery collector tutorial series in order to learn how to use unreal engine, and since I have no prior experience I’m having trouble making it compatible with the latest version of unreal engine. In Part 18, we set up a UENUM to keep track of the game state, with the following code :

BatteryCollectorGameMode.h :


//enum to store the current state of gameplay
UENUM(BlueprintType)
enum class EBatteryPlayState
{
    EPlaying,
    EGameOver,
    EWon,
    EUnknown
};

Compiling fails with the following error :


Error : Invalid BlueprintType enum base - currently only uint8 supported

How can I fix this ? I have no idea what a UEnum even is and the documentation seems to assume I should, therefore I can’t fix the problem myself.
Thank you for your help :slight_smile:



//enum to store the current state of gameplay
UENUM(BlueprintType)
enum class EBatteryPlayState **: uint8**
{
    EPlaying,
    EGameOver,
    EWon,
    EUnknown
};