Unknown override specifiers

[roots]

last name and first name are "unknown override specifier's"...what gives?
I can get this to work without the header.

#pragma once
#include <string>
struct studentInfo {
	string firstName;
	string lastName;
	int age;
	int testScores[3];
	int arrayLength;
	int gpa;
};
void initialize(studentInfo studentInfo[]);

////////////

#include <iostream>
#include "Header1.h"
#include <iomanip>

using namespace std;


int main()
{

	studentInfo student[2];
	initialize(student);
	print(student);


}

void initialize(studentInfo student[]) {

	
	for (int j = 0; j < 2; j++)
	{
		student[j].firstName = "";
		student[j].lastName = "";
		student[j].age = 0;
		for (int i = 0; i < 3; i++) 
		{
			student[j].testScores[i] = 0;
		}
	}
}

[E0p9LyTq]

Move line 19 using namespace std; below line 2 #include <string>

OR

change lines 4 & 5 to explicitly use the standard namespace qualifier:

std::string firstName;
std::string lastName;