unresolved external (for no reason?)

[NewCComer]

Hi, I get this error when trying to compile this simple code.

1>------ Build started: Project: Yes or No Program, Configuration: Debug Win32 ------
1> Source.cpp
1>Source.obj : error LNK2019: unresolved external symbol "char __cdecl askYesNo2(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?askYesNo2@@YADV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function _main
1>c:\users\Admin\documents\visual studio 2012\Projects\Yes or No Program\Debug\Yes or No Program.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

It doesn't make sense to me as I have included everything as instructed, and the code isn't the problem. Apperently I'm not including something but I have no idea what?

// Yes or No
// Demonstrates return values and parameters

#include <iostream>
#include <string>
using namespace std;

char askYesNo1();
char askYesNo2(string question);

int main()
{
	char answer1 = askYesNo1();
	cout << "Thanks for answering: " << answer1 << "\n\n";

	char answer2 = askYesNo2("Do you wish to save your game?");
	cout << "Thanks for answering: " << answer2 << "\n\n";

	return 0;
}

	char askYesNo1()
	{
		char response1;
		do 
		{
			cout << "Please enter 'y' or 'n' : ";
			cin >> response1;
		}while(response1 != 'y' && response1 != 'n');

			return response1;
	}

	char askYesNo2()
	{
		char response2;
		do
		{
			cout << "Please enter 'y' or 'n' :";
			cin >> response2;
		}while(response2 != 'y' && response2 != 'n');

		return response2;
	}

[Konstantin2]

In line 34 you define char askYesNo2() without parameters.
In line 16 you call char askYesNo2(string question) with parameter.
It's different functions.

[NewCComer]

Thanks, must be blind.