error: Ld returned 1 Exit status C++

Question

I wrote this code in C++ in Codeblocks with the Register Residents class, but this giving the error

error: Ld returned 1 Exit status

that I haven’t found anything that would help me on the internet. I don’t know how to program very well yet.

In one example, my teacher used this mode to "call the class" (I don’t know how to say, declare maybe?):

int main()
{
  Automovel p;
  p.CadastrarAutomovel();
  p.ImprimirAutomovel();
  system("pause");
}

and I didn’t understand why of the class name and then the "p" and then call the functions with "p." at the beginning. I’ve seen other examples but the lyrics were different.

my code:

#include <iostream>
#include <stdlib.h>
#include <conio.h>

using namespace std;

class Registrar_moradores
{
private:

    char nome[200][50];
    int telefone[200], npessoas[200],op,linha;

public:
  void cadastro() {

    do{
      cout<<"***CADASTRAMENTOS DOS MORADORES***"<<endl;
      cout <<"\nNome:";
      cin >>nome[linha];
      cout <<"\nNumero do seu telefone principal:";
      cin >>telefone[linha];
      cout<<"\nNumero de pessoas que moram em sua casa incluindo voce:";
      cin >>npessoas[linha];
      cout<<"\nCadastrar outra pessoa?\n1=Cadastrar\n2-Sair\nResposta:";
      cin>>op;
      linha++;
     }while (op==1);
  }
};

int main(){
  Registrar_moradores p;
  p.cadastro();
}