Re: error running my project

I need help in finding out why the error below, I am writing a through
away program in C++ using debian/testing machine.

thanks

**************** error ****************
fred@debian:~/myPrograms/common$ make clean; make; ./proj
rm -rf *.o proj
g++ -Wall -g -c -o read_data.o read_data.cpp
g++ -Wall -g -c -o read_data_test.o read_data_test.cpp
g++ -g -o proj read_data.o read_data_test.o -lgsl -lgslcblas -lm
gsl: fprintf_source.c:164: ERROR: fscanf failed
Default GSL error handler invoked.
Aborted
fred@debian:~/myPrograms/common$

**************** read_data.h ****************
#ifndef READ_DATA_H
#define READ_DATA_H
#include <string>
#include <cstdio>
#include <gsl/gsl_matrix.h>

class read_data
{
   int nRows, nCol;
   std::string file_name;
   void set_No_of_Rows_Cols();
   gsl_matrix * m; // from gsl_matrix.h
   void matrix_the_file();

public:
   read_data(std::string const& fileName);
   ~read_data();

};
#endif

**************** read_data.cpp ****************
#include <string>
#include <fstream>
#include <iostream>
#include <sstream>
#include <cstdlib>
#include <cstdio>
#include <gsl/gsl_matrix.h>
#include "read_data.h"

using namespace std;

read_data::read_data( string const& fileName )
   : file_name( fileName ){
   nCol = 0;
   nRows = 1;
   set_No_of_Rows_Cols();
   matrix_the_file();
}
void read_data::set_No_of_Rows_Cols() {
   ifstream in(file_name.c_str());
   string line;
   getline(in, line);
   stringstream input( line.c_str() );

   string word;
   while(input >> word)
      nCol++; // init'd by constructor

   while (getline(in, line))
      nRows++; // init'd by constructor
}
void read_data::matrix_the_file(){
   // allocate memory for the matrix
   // needs to be freed later using
   // void gsl_matrix_free (gsl_matrix * m)
   m = gsl_matrix_alloc (nRows, nCol);
   FILE * f = fopen(file_name.c_str(), "rb");
   gsl_matrix_fscanf (f, m);
   fclose(f);
   cout << "data read" << endl;
}
read_data::~read_data() {}

/*
std::string command = "wc -l";
std::system( ( command + " " + file_name ).c_str() );
}
*/

**************** read_data_test.cpp ****************
#include <fstream>
#include <iostream>
#include <string>
#include "read_data.h"

using namespace std;

int main() {
   string f = "../../data/ZB/Jun06/20060405";
    read_data data1( f ); // space delimited

}