how to create UUserDefinedStruct in c++

Development Programming & Scripting
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1

UCLASS()
class PROJECT_API UC_ActionStruct : public UUserDefinedStruct
{
GENERATED_BODY()

public:
UC_ActionStruct();

TMap<EPlayerType, FActionStruct> ActionDatas;

public:
void SetupSkilDataAsset(class UDataTable* table);

FActionStruct* GetActionDatas(EPlayerType type) { return ActionDatas.Find(type); }

};

UC_GameInstance::UC_GameInstance()
{
AllActionData = CreateDefaultSubobject<UC_ActionStruct>(FName(“ActionDatas”));
}

The program shuts down when compiling.
But when you turn it back on, it’s compiled.
Why is it popping?

Is UCLASS in UserDefinedStruct not available CLASS?