尝试按照“Unreal入门第一季 - 虚幻C++基础训练”的508课中的方法去对Actor添加默认静态网格时却发现编译数次都无法成功添加默认静态网格组件，想问下老师原因是什么；课程里用的是Pawn，理论上来说应该也适用于Actor，但运行结果总是不成功，附件不知道为何上传不上，代码如下：

MyActor.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "MyActor.generated.h"

UCLASS()
class TEST_API AMyActor : public AActor
{
    GENERATED_BODY()
    
public:    
    // Sets default values for this actor's properties
    AMyActor();

    UPROPERTY(VisibleAnywhere, category = "Actor Component")
    UStaticMeshComponent* MyStaticMesh;

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

public:    
    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

MyActor.cpp

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

#include "MyActor.h"
#include "Components/StaticMeshComponent.h"
#include "UObject/ConstructorHelpers.h"

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

    MyStaticMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MyStaticMesh"));

    static ConstructorHelpers::FObjectFinder<UStaticMesh> StaticMeshAsset(TEXT("StaticMesh'/Engine/BasicShapes/Cube1.Cube1'"));
    static ConstructorHelpers::FObjectFinder<UMaterialInterface> MaterialAsset(TEXT("Material'/Engine/MaterialTemplates/Gradients/Gradient_Star.Gradient_Star'"));

    MyStaticMesh->SetStaticMesh(StaticMeshAsset.Object);
    MyStaticMesh->SetMaterial(0,MaterialAsset.Object);

}

// Called when the game starts or when spawned
void AMyActor::BeginPlay()
{
    Super::BeginPlay();
    
    SetActorLocation(FVector(0.0f));
}

// Called every frame
void AMyActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);
    AddActorLocalOffset(FVector(0.1f,0.0f,0.0f));

}