I'm geting the " ld returned 1 exit status " error, how do i find the the hidden error

Question

i understand that this error means that there are hiden errors that have not bin located, I'm just having a hard time fingering out were those errors are. please give me some pointers on how to find the unknown error.

over the " ld returned 1 exit status " error are these two errors

• undefined reference to `MyList::count'

• bad reloc address 0x1 in section.text$_ZStorSt13_Ios_OpenmodeS_[_ZStorSt13_Ios_OpenmodeS_]

my progect consists of

• getData() to read info form a txt

• sortData() to sort the info

• saveData() to save the info in a txt

here is the class and the program

#include <iostream>
#include <fstream>
using namespace std;
class MyList{
    private: 
        int info2[100][2], info[100][2];
        int count = 0;
    public:
        void getData(string);
        void saveData(string);
        void sortData();
};
void MyList::getData(string a){
    int i;
    ifstream file;
    file.open(a.c_str());
        if(!file.is_open()){
            cout << " File did not open, can not read" <<endl;
            return;
        }
        for(i=0; ;i++){
            file >> info[i][0] >> info[i][1];
            if(file.eof()){
                break;
            }
        }
        count=i;
    file.close();
}

void MyList::sortData(){
    ifstream file;
    int i,a,b,c,flag=1;
    int j=0;
    for(i=0;i<count;i++){
        for(i=0;(i<=count-1) && flag;i++){
            if(info[i][a] < info[i+1][a]){

                info2[b][c] = info[i][a];
                info[i][a] = info[i+1][a];
                info[i+1][a] = info2[b][c];
                flag = 1;
            }
        }
    }
}
void MyList::saveData(string a){
    int i;
    ofstream file(a.c_str());
        if(!file.is_open()){
            cout << " File did not open, can not save" <<endl;
            return;
        }
    for(i=0;i>=count;i++){
        file << info[i][0] << info[i][1];
    }
}


#include <iostream>
#include "aList.h"
using namespace std;

here's the project that is giving the error

int main(){
    MyList obj;
    string fileName;

    cout << " what is your files name? :";
    cin >>fileName;
    obj.getData(fileName);
    obj.sortData();
    obj.saveData(fileName);

    return 0;
}