Lỗi C2679 binary '>>': no operator found which takes a right-hand operand of type 'Fraction' (or there is no acceptable conversion)

Em đang làm bài tập về nạp chồng toán tử thì gặp lỗi

Error (active)	no operator ">>" matches these operands
Error (active)		no operator "<<" matches these operands	

Error	C2679 binary '>>': no operator found which takes a right-hand operand 
of type  'Fraction' (or there is no acceptable conversion)

Error	C2679	binary '<<': no operator found which takes a right-hand operand
of type 'Fraction' (or there is no acceptable conversion)

.Em đã google nhưng cho ra các kết quả không như mong đợi. Mong các anh / chị giúp đỡ em với
Đây là code của em:

File: fraction.h

#ifndef _FRACTION_

#define _FRACTION_

#include <iostream>
using namespace std;

class Fraction {

public:
	Fraction(int, int);
	int GetNumerator();
	int GetDenominator();

private:
	int Numerator;
	int Denominator;
};

#endif // _FRACTION_

File: fraction.cpp

#include "fraction.h"

Fraction::Fraction(int _numerator = 1, int _denominator = 2) {

	this->Numerator = _numerator;
	this->Denominator = _denominator;
}

int Fraction::GetNumerator() {

	return this->Numerator;
}

int Fraction::GetDenominator() {

	return this->Denominator;
}

std::istream &operator >> (std::istream &in, Fraction &_fraction) {

	int _numerator = 0;
	cout << "
 Enter the numerator: ";
	in >> _numerator;

	int _denominator = 0;

	do {
		cout << " Enter the denominator: ";
		in >> _denominator;
	} while (_denominator == 0);

	_fraction = Fraction(_numerator, _denominator);
	return in;
}

std::ostream &operator<<(std::ostream &out, Fraction _fraction) {

	return out << _fraction.GetNumerator() << " / " << _fraction.GetDenominator() << endl;
}

File: main.cpp

#include "fraction.h"

int main() {

	Fraction mFraction(2, 3);

	cin >> mFraction;
	cout << mFraction;

	system("pause");
	return 0;
}

Thanks a lot !