Issue creating a 3D Mesh(Access violation)

I was following a tutorial on how to assign a mesh to a staticMesh and I get the following error:

Exception thrown at 0x00007FFD8F47DD5A (UE4Editor-Engine.dll) in UE4Editor.exe: 0xC0000005: Access violation reading location 0x0000000000000098.

static ConstructorHelpers::FObjectFinder<UStaticMesh> CubeAsset(TEXT("/SideScrollerTest/Content/Geometry/Meshes/1M_Cube"));

Whole cpp script:

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

#include "MyActor.h"
// Sets default values
	// 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;
	UStaticMeshComponent* Cube = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("3D Design"));
	 static ConstructorHelpers::FObjectFinder<UStaticMesh> CubeAsset(TEXT("/SideScrollerTest/Content/Geometry/Meshes/1M_Cube"));

	if (CubeAsset.Succeeded()){
		staticMesh->SetRelativeLocation(FVector(0.0f, 0.0f, 0.0f));

// Called when the game starts or when spawned
void AMyActor::BeginPlay()
	UE_LOG(LogTemp, Warning, TEXT("Hello World!"));

// Called every frame
void AMyActor::Tick(float DeltaTime)



P.s I have no idea where to put this, the topics are so vague(Their descriptions are one sentence long, the hell?) that I decided since it’s realtime in the editor that I should put it under editor scripting.