unknown error while defining a constructor

[roskee]

This week i was working on a console based snake game. i created graphics.h,snake.h and mouse.h classes for my project. in the snake class i had a constructor with a char and graphics parameters and it worked fine. but when i create a constructor for the mouse class with a char and a graphics parameter the compiler says syntax error: identifier 'graphics'.
here is the code for the classes.

  //the snake.h 
#ifndef SNAKE_H
#define SNAKE_H
#include "Graphics.h"
#include "Mouse.h"
class Snake
{
    friend Graphics* operator<< (Graphics*,const Snake &);
    friend Graphics& operator<< (Graphics&,const Snake &);
    public:
        enum direction{UP,DOWN,LEFT,RIGHT};
        Snake(char,Graphics&); // this constructor works fine
        ~Snake();
        bool move(direction);
        bool eats(Mouse&);
    protected:

    private:
        char snake;
        int** snakelocs;
        int snake_length;
        Graphics &gfx;
};

#endif // SNAKE_H
//the mouse.h
#ifndef MOUSE_H
#define MOUSE_H
#include "Graphics.h"
class Mouse
{
    public:
        Mouse(char,Graphics &); // this is the source of the error
        ~Mouse();
        void on_eaten();
        const int* get_loc();
        char get_mouse();
    protected:

    private:
        char mouse;
        int* loc;
        Graphics &gfx; // there is an error here too. i tried initializing it in the constructor as mouse(char x,Graphics g):mouse(x),gfx(g){}
};

#endif // MOUSE_H 

[Repeater]

syntax error: identifier 'graphics'.

This code contains no graphics. It does have Graphics. Case matters. What does the error say, exactly?

[roskee]

Sorry for the case mistake.
in eclipse it says 'Graphics has not been declared' for the constructor and
'Graphics does not name a type' for the declaration of the member variable Graphics &gfx.
i have included the header file 'Graphics.h' in the mouse.h file.

[Repeater]

And what does the Graphics.h file look like?

[roskee]

#ifndef GRAPHICS_H
#define GRAPHICS_H
#include <iostream>
#include "Mouse.h"
using namespace std;
class Graphics
{
	friend ostream& operator<<(ostream&, const Graphics &);
	friend ostream& operator<<(ostream&, const Graphics*);
public:
	Graphics(int, int);
	~Graphics();
	void putPixel(char, int, int);
	void clear();
	int get_width();
	int get_height();
	Graphics& operator<< (Mouse &);
protected:

private:
	char** pixels;
	int height, width;
};

#endif // GRAPHICS_H