error C2664: 'void (int,int,std::ofstream &)' : cannot convert argument 3      from 'std::basic_string<char,std::char_traits<char>,std::allocator<char>>' to 'std::ofstream &'.

void writePrimesToFile(int begin, int end, ofstream&  file)
{
    int i, j, prime = 1;

    for (i = begin; i <= end; i++)
    {
        for (j = begin; i <= end / 2; j++)
        {
            if (i % j == 0)
            {
                prime = 0;
            }
            else
            {
                file << i << endl;
            }
        }

    }

}

void callWritePrimesMultipleThreads(int begin, int end, string filePath, int N)
{
    double startTimer, stopTimer;

    startTimer = clock();
    thread* arr = new thread[N];
    for (int i = 0; i < N; i++)
    {
        int start = begin;
        int finish = N;
        arr[i] = thread(writePrimesToFile, start, finish, ref(filePath));
        start = finish;
        finish += N;
    }
    for (int i = 0; i < N; i++)
    {
        arr[i].join();
    }
    stopTimer = clock();
    cout << "The time that takes is: " << double(stopTimer - startTimer) / CLOCKS_PER_SEC << endl;
}