C2027 Use of undefined type 'ACharacter'

[7MinutesDead]

I can’t seem to figure out why the compiler is telling me ACharacter is undefined from this line:

PlayerControllerRef = Cast<APlayerControllerBase>(UGameplayStatics::GetPlayerCharacter(this, 0));

Specifically in this context:

#include "TankGameModeBase.h"
#include "ToonTanks/Pawns/PawnTank.h"
#include "ToonTanks/Pawns/PawnTurret.h"
#include "Kismet/GameplayStatics.h"
#include "ToonTanks/PlayerControllers/PlayerControllerBase.h"

// -------------------------------------------------------------------------------------------
void ATankGameModeBase::BeginPlay()
{
	Super::BeginPlay();
	HandleGameStart();
}

// ...

void ATankGameModeBase::HandleGameStart()
{
	UpdateTurretsAlive();
	PlayerTank = Cast<APawnTank>(UGameplayStatics::GetPlayerPawn(this, 0));
	PlayerControllerRef = Cast<APlayerControllerBase>(UGameplayStatics::GetPlayerCharacter(this, 0));    // C2027 undefined type 'ACharacter' from GetPlayerCharacter.
	GameStart();

	// To make sure the player can't move during countdown.
	if (PlayerControllerRef) {
		PlayerControllerRef->SetPlayerEnabledState(false);

		FTimerHandle PlayerEnableHandle;
		// TODO: I don't understand this at all.
		FTimerDelegate PlayerEnableDelegate = FTimerDelegate::CreateUObject(
			PlayerControllerRef,
			&APlayerControllerBase::SetPlayerEnabledState,
			true
			);

		GetWorld()->GetTimerManager().SetTimer(
			PlayerEnableHandle,
			PlayerEnableDelegate,
			StartDelay,
			false);

	}
}

Header:

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "ToonTanks/PlayerControllers/PlayerControllerBase.h"

#include "TankGameModeBase.generated.h"

// -------------------------------------------------------------------------------------------
// Forward declarations.
class APawnTurret;
class APawnTank;


// -------------------------------------------------------------------------------------------
UCLASS()
class TOONTANKS_API ATankGameModeBase : public AGameModeBase
{
	GENERATED_BODY()

public:
	void ActorDied(AActor* DeadActor);

private:
	UPROPERTY()
	APawnTank* PlayerTank;
	UPROPERTY()
	TArray<AActor*> Turrets;
	UPROPERTY()
	APlayerControllerBase* PlayerControllerRef;
	void HandleGameStart();
	void HandleGameOver(bool PlayerWon);
	void UpdateTurretsAlive();

protected:
	virtual void BeginPlay() override;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="Game Loop")
	int32 StartDelay = 3;

	// The following UFUNCTIONs mean we'll be able to implement these functions in Blueprints.
	// Certain things like setting timers and creating widgets are much faster and easier in BP.

	UFUNCTION(BlueprintImplementableEvent)
	void GameStart();

	UFUNCTION(BlueprintImplementableEvent)
	void GameOver(bool PlayerWon);
};

Full log is:

  PointerIsConvertibleFromTo.h(19): [C2027] use of undefined type 'ACharacter'
  GameplayStatics.generated.h(55): see declaration of 'ACharacter'
  PointerIsConvertibleFromTo.h(60): see reference to class template instantiation 'UE4PointerIsConvertibleFromTo_Private::TImpl<From,To,ACharacter,UObject>' being compiled
  Casts.h(93): see reference to class template instantiation 'TPointerIsConvertibleFromTo<T,volatile const UObject>' being compiled
  TankGameModeBase.cpp(61): see reference to function template instantiation 'To *Cast<APlayerControllerBase,ACharacter>(From *)' being compiled
  PointerIsConvertibleFromTo.h(19): [C2338] TPointerIsConvertibleFromTo must not be instantiated with incomplete types
  Casts.h(93): [C2976] 'TIsIInterface': too few template arguments
  Casts.h(40): see declaration of 'TIsIInterface'
  Casts.h(111): [C2976] 'TGetCastType': too few template arguments
  Casts.h(95): see declaration of 'TGetCastType'
  Casts.h(219): [C2976] 'TCastImpl': too few template arguments
  Casts.h(113): see declaration of 'TCastImpl'
  Casts.h(219): [C2665] 'TCastImpl<From,To,ECastType::UObjectToUObject>::DoCast': none of the 2 overloads could convert all the argument types
  Casts.h(152): could be 'To *TCastImpl<From,To,ECastType::UObjectToUObject>::DoCast(FField *)'
  Casts.h(141): or       'To *TCastImpl<From,To,ECastType::UObjectToUObject>::DoCast(UObject *)'
  Casts.h(219): while trying to match the argument list '(From *)'

[beegeedee]

In the header, you need to add forward declaration to the PlayerControllerRef.
class APlayerControllerBase* PlayerControllerRef;
Also, in your cpp file you need the include for ACharacter

[DanM]

@7MinutesDead

Cast<APlayerControllerBase>(UGameplayStatics::GetPlayerCharacter(this, 0))

Provided you do include Character.h this isn’t going to ever succeed; they are unrelated types.
You want GetPlayerController not character.

[7MinutesDead]

Well that reveals my problem. I sleepily went with Rider’s autocomplete and picked GetPlayerCharacter rather than GetPlayerController in the video lol.