How to fix "C2679: binary '>>' : no operator found" error?

[Terry Archer]

Error 1 error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
 
int main()
{
    string lastName1, firstName1, lastName2, firstName2, lastName3, firstName3;
    double currentSalary1, currentSalary2, currentSalary3;
    double percentPayIncrease1, percentPayIncrease2, percentPayIncrease3;
    double updatedSalary1, updatedSalary2, updatedSalary3; 
 
    ifstream fin;
    ofstream fout;
 
    fin.open("Ch3_Ex8Data.txt");
    fout.open("Ch3_Ex8Output.txt");
 
    fin >> lastName1 >> firstName1 >> currentSalary1 >> percentPayIncrease1;
    fin >> lastName2 >> firstName2 >> currentSalary2 >> percentPayIncrease2;
    fin >> lastName3 >> firstName3 >> currentSalary3 >> percentPayIncrease3;
 
    updatedSalary1 = currentSalary1 * percentPayIncrease1 + currentSalary1;
    updatedSalary2 = currentSalary2 * percentPayIncrease2 + currentSalary2;
    updatedSalary3 = currentSalary3 * percentPayIncrease3 + currentSalary3;
 
    fout << firstName1 << lastName1 << updatedSalary1;
    fout << firstName2 << lastName2 << updatedSalary2;
    fout << firstName3 << lastName3 << updatedSalary3;
 
    fin.close();
    fout.close();
 
return 0;
}

[horace1]

try adding

#include <string>
 

otherwise what line is the error on?