MS Visual C++ error C2065: 'highS' : undeclared identifer

I am making a scoring system for a game but I am having trouble. I get this error: error C2065: 'highS' : undeclared identifier. I am using the info from this tutorial   http://thenewboston.org/watch.php?cat=16&number=69   and even though I am doing it pretty much the same I get this error. I have made a file called highscores.txt in the correct folder but if you want to know it looks like this: 

0 empty
0 empty
0 empty

Here is my game code:

void load();
void Nscore();
void display();

int HS[3];
string HSN[3];
int score;

void main()
{
	ifstream highS("highscores.txt");
	load();
	display();
	_getch();
}

void Nscore(){
	cout << "Enter a new score" << endl;
	cin >> score;
}

void load(){
	int hs;
	string hsn;
	for(int x = 0; x < 3; x++){
		while(highS >> hs >> hsn){
			cout << endl;
		}
	}
}

void display(){
	
}

I would really like to get this figured out. Also if anyone could point me to a good tutorial for C++ file management I would appreciate it a lot. Thank you.