c++ 컴파일시 read: Is a directory error 질문입니다 (뉴비)

C:\pumpkin\pumpkin\src>g++ pumpkin.cpp ./input_10
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: error: ./input_10: read: Is a directory
collect2: error: ld returned 1 exit status

#include <iostream>
#include "pk_IO.h"
#include "pk_DataTypes.h"
#include "pk_Pathways.h"
#include "pk_Print.h"
 
using namespace std;
 
size_t n_R;         // number of reactions
size_t n_S;         // number of species
size_t n_t;         // number of time-steps
double t_init;      // initial time
double t_end;       // final time
double f_min;
double tau_lifetime;
int interest;
int max_path;
int max_bp;
bool global_kin;
 
int main(int argc, const char *argv[])
{
    // Reads the location of input folder
    string folder = "";
    if (argc > 1) folder = string(argv[1]);
 
    cout.precision(12);
 
    Print_license();
 
    In_data kinetics;               // Keeps all input data
    Rates   rates;                  // Keeps all total rates
 
    Read_kin(kinetics, folder);     // Reads input file
    Average_kin(kinetics, rates);  // Average input data
 
    vector<pathway> PATHS(n_R);     // The set of all pathways
    Initialize_PATHS(PATHS, kinetics, rates);
    Initialize_rates(PATHS, kinetics, rates);
 
    // All brenching points so far
    vector<int> all_brenching_points;
 
    // Run baby, run!
    Run(PATHS, all_brenching_points, kinetics, rates);
 
    Print_Results(PATHS, rates, kinetics, folder, all_brenching_points);
 
    return 0;
}