C++奇数编译错误:从“对象”类中改变“对象”的意义

我都不知道该怎么办。谷歌帮不了什么忙。和我前面的问题一样。我正在使用TextMate的命令+R来编译这个项目。

game.h:16:错误:声明玩家*半集::玩家()常量

players.h:11:error:将“Player”的含义从“class Player”更改为“class Player”

游戏。h:21:错误:玩家不是一种类型

#ifndef PLAYERS_H
#define PLAYERS_H
using namespace std;

#include <string>
#include <vector>
#include <istream>
#include <iomanip>
#include "generics.h"

class Player{ //Line 11
public:
    //getters
    long Id() const;
    string FirstName() const;
    string LastName() const;
    string Country() const;
    //setters
    void setId(long id);
    void setFirstName(string s);
    void setLastName(string s);
    void setCountry(string s);
    //serializing functions
    void display(ostream &out);
    void read(istream &in);
    void write(ostream &out);
    //Initalizers
    Player();
    Player(istream &in);
    Player(string firstName, string lastName);
    Player(string firstName, string lastName, string country);
    Player(long id, string firstName, string lastName, string country);
    ~Player();
private:
    long _id;
    string _firstName;
    string _lastName;
    string _country;
};

game.h文件(部分)

#ifndef GAME_H
#define GAME_H

#include "generics.h"
#include "players.h"
#include <string>
#include <vector>
#include <istream>
#include <iomanip>

using namespace std;

class HalfSet{
public:
    //getters
    Player* Player() const; //Line 16
    int GamesWon() const;
    int TotalPoints() const;
    int Errors() const;
    //setters
    void setPlayer(Player* p);
    void setGamesWon(int games);
    void setTotalPoints(int points);
    void setErrors(int errors);
    //Serialization
    void display(ostream &out) const;
    void read(istream &in) const;
    void write(ostream &out) const;
    //Initalizers
    HalfSet();
    ~HalfSet();
private:
    Player* _player;
    int _gamesWon;
    int _points;
    int _errors;
};

这是怎么回事?