I am new to c++, I am trying to parse a stl file which is of about 64MB and has about ~18K lines in it. The code works fine for first few 100 lines but then fgets throws following exception:

"Unhandled exception at 0x77B0BAC5 (ntdll.dll) in STLparser.exe: 0xC0000024: There is a mismatch between the type of object required by the requested operation and the type of object that is specified in the request."

I have checked manually the line for which fgets throws exception, there is nothing out of ordinary there. I am out of options for now. Any help to fix this issue will be greatly appreciated.

================CODE==========================

#include<fstream>
#include<iostream>
#include"ParseString.h"
#include"Vectors.h"


using namespace std;

int main(void)
{
    //Define variables
    FILE *file;
    char *line = new char;
    parsestring oneline;
    int n_Vols = 0, n_Elms = 0, n_nods = -1, E = 0;
    Nod *nodes = new Nod();
    Nod dummy;
    Elm *elements = new Elm();
    int mycounter = 0;
    //Open file
    fopen_s(&file, "sample.stl", "r");
    while (fgets(line, 1024, file) != NULL) //**********Getting Error Here*************
    {
        // populate required data

    }

    fclose(file);
    printf("%d,%d,%d", n_Vols, n_Elms, n_nods);
    getchar();
    return 0;
}

===================When broken, execution resumes at this function (not my function, something internal)

void __cdecl _unlock ( int locknum ) { /* * leave the critical section. */ LeaveCriticalSection( _locktable[locknum].lock ); }