Object serialization error with Boost

Question

I am trying to store a User object and then read the stored object using the boost serialization library and VS2015 community. I followed the tutorial here. Currently the read/write object to file works just fine; however, after reading the object back in I cannot access any of the objects members (i.e. username and pw_hash). Is there something I am missing? I have seen tons of questions how to write/read the object using the library but none that show anyone accessing the objects members after reading the object from file.

Class:

#ifndef USER_H
#define USER_H

#include <fstream>
#include <string>
#include <boost\serialization\string.hpp>
#include <boost\archive\text_oarchive.hpp>
#include <boost\archive\text_iarchive.hpp>

#include "Hash.h"

class User
{
   public:
      User();
      User(std::string & name, std::string & pwd);
      ~User();

   private:
      std::string pw_hash;
      std::string username;

      inline std::string get_username();
      inline void set_username(const std::string & name);
      inline std::string get_PwHash();
      inline void set_PwHash(const std::string & hash);

      friend class boost::serialization::access;
      template<class Archive>
      void serialize(Archive & ar, const unsigned int version)
      {
         ar & username;
         ar & pw_hash;
      }
};
#endif

Below is where I encounter my problem. After the object is read from memory, VS2015 underlines test2.get_username() saying it is inaccessible.

Implementation:

#include "User.h"
int main(int argc, char *argv[])
{
   User test("User1", "Password");
   std::cout << test.get_username() << std::endl;
   {
      std::ofstream ofs("User1");
      boost::archive::text_oarchive oa(ofs);
      oa << test;
   }

   User test2();
   {
      std::ifstream ifs(username);
      boost::archive::text_iarchive ia(ifs);
      ia >> test2;
      //error
      std::cout << test2.get_username() << std::endl;
   }
   return 0;
}