[RESOLVED] what's wrong with 'cout' with strings?:(

[Cambalinho]

see these class:

#include <iostream>
#include <Windows.h>
#define MY_BUFSIZE 1024
using namespace std;




class Console
{
char pszOldWindowTitle[MY_BUFSIZE];


	public:
string Title() //the problem seems to be here, but no erro message here
	{		
		GetWindowText(GetForegroundWindow(), pszOldWindowTitle, GetWindowTextLength(GetForegroundWindow()) + 1);
		return string(pszOldWindowTitle);
	}
	
	void Title(string title)  //these procedure works fine
	{		
		SetConsoleTitle(title.c_str());
	}
};

(sorry the indention, but i can't use 'TAB' key)
and heres how i use it:

#include "stdafx.h"
#include "Console.h"
#include <iostream>
#include <conio.h>


int _tmain(int argc, _TCHAR* argv[])
{
	Console a;
    string b =string(a.Title());


    cout << "Title: " << b << endl; //i get 1 problem in second '<<'


    Sleep(5000);


    a.Title("Hello World");


    getch();


    return 0;
}

error message:

1 - "error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)";

2 - " IntelliSense: no operator "<<" matches these operands".

what is wrong with cout???? isn't the 1st time that i get these type of error, but i continue without understand why
can anyone explain to me?