unresolved external symbol problems

[AmazingBKaiser]

I am trying to access the SetUp object that I made from another class, but I am getting these errors :

1>SetUp.obj : error LNK2019: unresolved external symbol "private: class SetUp __thiscall SetUp::_setUp(void)" (?_setUp@SetUp@@AAE?AV1@XZ) referenced in function "public: void __thiscall SetUp::setSetUp(class SetUp)" (?setSetUp@SetUp@@QAEXV1@@Z)

1>SetUp.obj : error LNK2019: unresolved external symbol "class Battle __cdecl battle(class SetUp)" (?battle@@YA?AVBattle@@VSetUp@@@Z) referenced in function "public: void __thiscall SetUp::SetUpBattle(void)" (?SetUpBattle@SetUp@@QAEXXZ)

Here is some of my code:

SetUp.cpp
#include "SetUp.h"
#include "Battle.h"

Pokemans pokeman;

Player player1("Player1");
Player player2("Player2");
Battle battle(SetUp setUp);

SetUp::SetUp(){
	
	_player1 = player1;
	_player2 = player2;
	cout << player1.getName() <<" Choose Ur Pokeman \n\n" ;
	SetUpPokemans();
	SetUpPlayer(player1);
	cout << player2.getName() <<" Choose Ur Pokeman \n\n" ;
	SetUpPlayer(player2);

	system("PAUSE");

	SetUpBattle();
	return;
}

void SetUp::SetUpPokemans(){
	Moves move;
	int b = 1;
	vector <Moves> movesM;
	for(b ; b <= 4; b++){
	movesM.push_back(move.movesList(b));
	}
	vector <Moves> movesP;
	for(b ; b <= 8; b++){
	movesP.push_back(move.movesList(b));
	
	}
	vector <Moves> movesH;
	for(b ; b <= 12; b++){
	movesH.push_back(move.movesList(b));	
	}

	
	pokeman.setPokemans("Munchkip", 50, 50, 0, movesM);
	pokeman.setPokemans("Pedulu", 50, 50, 1, movesP);
	pokeman.setPokemans("Habska", 50, 50, 2, movesH);
	vector <Pokemans> _pokemans  = pokeman.getPokemans();
	
	Pokemans poke;

	for( unsigned int a = 0; a < _pokemans.size(); a ++ )
   {
	   cout << a + 1 <<" _ _ _ _ _ _    "<<_pokemans[a].getName() << ":   "<<poke.getMoveName(_pokemans[a], 1) <<", "<<poke.getMoveName(_pokemans[a], 2)<< ", "<<poke.getMoveName(_pokemans[a], 3)<< ", "<<poke.getMoveName(_pokemans[a], 4)<<  endl;
	
	   
   }
		
	return;

}

void SetUp::SetUpPlayer(Player player){
	int input = 0;
	
	
	cin >> input;
	
	vector <Pokemans> pokemans  = pokeman.getPokemans();
	
	switch (input){
		
		case 1:
			player.setPokeman(pokemans[input - 1]);
			break;
		case 2:
			player.setPokeman(pokemans[input - 1]);
			break;
		case 3:
			player.setPokeman(pokemans[input - 1]);
			break;

	}
	
	cout << player.getName() <<" Chose : " << player.getPokemanName() << endl << endl << endl;

	if(player.getName() == "Player1"){
		_player1.setPokeman(player.getPokeman());
		
	}else{
		_player2.setPokeman(player.getPokeman());
	
	}
	return;
}


void SetUp::clearScreen(){
  system("cls");
  return;
}

SetUp::SetUp(int rand){
	cout << "hi";

}

Player SetUp::getPlayer(int num){
	switch (num){
	case 1:
		return _player1;
		break;
	case 2:
		return _player2;
		break;
	default:
		break;
	}
	Player player("ERROR");
	return player;
}


void SetUp::setSetUp(SetUp set_Up){
	_setUp() = set_Up;
	return;
}

SetUp SetUp::getSetUp(){
	return _setUp();
}
void SetUp::SetUpBattle(){
	SetUp setUp(3);
	setUp = _setUp();
	battle(setUp);
	
}

SetUp.h

#pragma once
#include <string>
#include <iostream>
#include "Pokemans.h"
#include "Player.h"



using namespace std;

class SetUp
{
public:
	SetUp();
	SetUp(int rand);
	void SetUpPokemans();
	void SetUpBattle();
	void SetUpPlayer(Player player);
	void clearScreen();
	Player getPlayer(int num);
	void setSetUp(SetUp setUp);
	SetUp getSetUp();

private:
	Player _player1;
	Player _player2;
	SetUp _setUp();
};


Battle.cpp
#include "Battle.h"


Battle::Battle(SetUp set_Up(int i)){

	
	set_Up(3).clearScreen();
	cout << "\n**********LET THE BATTLE BEGIN************\n\n\n";
	system("PAUSE");
	printBattle();
	Player p1 = set_Up(3).getPlayer(1);
	Player p2 = set_Up(3).getPlayer(2);

	cout << p1.getName() << " with "<<p1.getPokemanName() << endl << endl << endl << endl << endl << endl<< endl<< endl<< endl<< endl<< endl<< endl<< endl<< endl << p2.getName() << " with "<<p2.getPokemanName();
	return;
}

void Battle::printBattle(){
	SetUp setUp(3);
	setUp.clearScreen();
	return;

}



Battle.h
#pragma once
#include "SetUp.h"

class Battle
{
public:
	Battle(SetUp setUp(int i));
	void printBattle();

private:
	SetUp _setUp(int i);
};

I have been trying to fix this for ALONG time and I dont know what to do.
Everything was working before I implemented the Battle Class, so dont worry about that

[TarikNeaj]

SetUp _setUp(); You've declared this function private. Its a function, not an object. That is your problem. If you want an object, remove the ().

void SetUp::SetUpPlayer(Player player)

When your function takes a class object, you gotta do it by reference. So

void SetUp::SetUpPlayer(Player& player) // add &

Do that everywhere that you take a class obejct.

Edit: And to add to what I said first.

 SetUp::setSetUp(SetUp set_Up){
	_setUp() = set_Up;
	return;
}

You cant do that. _setUp is a function, you cant assign a object to a function, that makes no sense if you think about it.

[AmazingBKaiser]

I did that but now I am getting an error in my main.cpp file at l.20(setUp.setSetUp(setUp(3));)



Error 1 error C2064: term does not evaluate to a function taking 1 arguments

#include <iostream>
#include <string>

#include "SetUp.h"

using namespace std;

int main () {
	
	
	bool isDone = false;
	
	

	

	cout << "**********Welcome To Pokeman Battles***************"<< endl << endl<<endl<<endl;
	
	SetUp setUp;
	setUp.setSetUp(setUp(3));
	
	

	while(isDone == false){
		
		
		
	}

	system("PAUSE");
	return 0;
}

Still thanks for helping me :D, but I would be grateful if you could explain a bit about the refence thing (I am still very new to c++).