Can't create a new Card class using assignment operator

Development Programming & Scripting C++
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1

Hey, I’m new to Unreal 4, and I’m trying to make a shuffling deck of cards as a first project. I’m trying to use the assignment operator to get the top card of the deck (which stores cards in a std::stack), but there’s something about the assignment operator that I don’t know how to fix. The code in Deck.cpp that’s causing an error is:

//Draw a card by removing the top of the deck. Return the drawn card
ACard ADeck::Draw()
{
	ACard drawnCard;
	drawnCard = (this->deck).top(); //Problematic line
	(this->deck).pop();
	return drawnCard;
}

The error I get is:
Severity Code Description Project File Line Suppression State
Error (active) E0330 “ACard &ACard::operator=(const ACard &)” (declared at line 12 of “e:\Programs\Epic Games\Projects\Cards\Source\Cards\Card.h”) is inaccessible Cards e:\Programs\Epic Games\Projects\Cards\Source\Cards\Deck.cpp 42

I haven’t overloaded the operator myself, since it’s not in my source code:

Card.h

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

#pragma once

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

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

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

public:	
	// Called every frame
	//virtual void Tick(float DeltaTime) override; //Not needed, since the card remains pretty static

	UPROPERTY(EditAnywhere)
	int value;
	
	void SetValue(int value);
};

Any help would be much appreciated