Help defineing class in cpp file

[supperpiccle]

I've googled but cannot find the solution. Heres a small simple version of the code that gives the problem

class GAME
{
    public:
    GAME(sf::RenderWindow & rw);
    ~GAME();

    bool Start(sf::RenderWindow & rw);


    private:
    void InitBackground();
    void HandlePlateforms(VisibleGameObject Object);

#include GAME.h
GAME::GAME(sf::RenderWindow & GameWindow){
}

void GAME::InitBackground()
{
}
bool GAME::Start(sf::RenderWindow & rw)
{
}

now the first snippet was from GAME.h and the 2nd from GAME.cpp i include GAME.h in GAME.cpp but i get errors saying extra quliafication on each function in GAME.cpp and that it cannot be overloaded with the functions in GAME.h....can somebody plz help