Updating the ScreenManager and ScreenManagerRemoteControl classes
Open the ScreenManagerRemoteControl.h file and uncomment everything so that the code is the same as the following. I have highlighted the lines that have been uncommented:
#pragma once
#include <string>
#include <vector>
#include "GameObject.h"
#include "GameObjectSharer.h"
using namespace std;
class ScreenManagerRemoteControl
{
public:
    virtual void SwitchScreens(string screenToSwitchTo) = 0;
    virtual void loadLevelInPlayMode(string screenToLoad) = 0;
    virtual vector<GameObject>& getGameObjects() = 0;
    virtual GameObjectSharer& shareGameObjectSharer() = 0;
};
Next, open ScreenManager.h, which implements this interface and uncomments all the commented-out code. The code in question is abbreviated and highlighted as follows:
... #include "SelectScreen.h" //#include...
