I've created new poject and added new c class, but after using SetupAttachment UE has an error. I've tryed to fix it and found a probem. For now i don't know, in what problem, i actualy know the place. UE5 window after building

Code:

Header:

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "TankController.generated.h"

class USpringArmComponent;
class UCameraComponent;

UCLASS()
class TANKS_API ATankController : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    ATankController();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

    //DEFINTE COMPONENTS //

    // Do a Hull of the Tank
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Hull;

    // Wheels for the Tank
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Wheel1;
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Wheel2;

    //Tower of the Tank
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Turret;
  
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Barrel;

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* RecoilSystem;

    // Camera Components

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    USpringArmComponent* SpringArm;
  
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UCameraComponent* Camera;

public: 

    // Called to bind functionality to input
    virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

};

And cpp:

// Fill out your copyright notice in the Description page of Project Settings.


#include "TankController.h"

#include "GameFramework/SpringArmComponent.h"

// Sets default values
ATankController::ATankController()
{
    // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = false;

    // Set Root Component to ours Hull
    RootComponent = Hull;

    // Attach Wheels to the Hull
    // Here i have an error
    SpringArm->SetupAttachment(Hull);

}

// Called when the game starts or when spawned
void ATankController::BeginPlay()
{
    Super::BeginPlay();
    
}

// Called to bind functionality to input
void ATankController::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

}

How to fix this errror? Is it mine mistake, or UE bug?

CodePudding user response：

It’s your mistake. You’re never initializing SpringArm, and even if it were set in your actor instance (or through a blueprint or subclass), it wouldn’t be available during the constructor (and would still crash when constructing the CDO).