Error occuring in Vivado HLS 2015.4 while Synthesizing the program

Code C - [expand]
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#ifndef FACTORIAL_H_
#define FACTORIAL_H_
#include <cmath>
#include <fstream>
#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;
 
#include "factorial.h"
#include "ap_int.h"
typedef ap_int<128> in1_t;
typedef ap_int<1024> out_t;
 
int factorial(in1_t N);
 
#endif

Code C - [expand]
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#include "factorial.h"
int factorial(in1_t N)
{
#pragma HLS INTERFACE s_axilite port=N bundle=a
#pragma HLS INTERFACE s_axilite port=return bundle=a
int i;
out_t fact =1;
for (i=1; i<=N; i++)
{
fact = fact*i;
}
return fact;
}

Code C - [expand]
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#include <stdio.h>
#include <stdlib.h>
#include "ap_int.h"
#include "factorial.h"
int main()
{
in1_t N =30;
out_t fact;
int i;
fact=1;
factorial(N, fact);
 
for (i=1; i<=N; i++)
{
fact = fact*i;
}
cout << "cout of fact: " << fact;
}