Ошибка при компиляции c++!

#include <iostream>
#include "UDPSocket.h"
class Server
{
private:
    UDPSocket* socket;
    std::thread* networkthread;
    int port;
public:
    Server(int port);
    void handlePacket();
};

Не могу понять в чём же дело.

UDPSocket.h
#ifndef _SOCKET_H_
#define _SOCKET_H_
#include <exception>
#include <mutex>
#ifdef __unix__
#   include <errno.h>
#   include <sys/types.h>
#   include <sys/socket.h>
#   include <sys/un.h>
#   include <netinet/in.h>
#   include <netdb.h>
#   include <arpa/inet.h>
#   include <unistd.h>
#define INVALID_SOCKET -1
#else
#   include <winsock2.h>
#   include <Ws2tcpip.h>
#   include <windows.h>
#   ifdef _MSC_VER
#       pragma comment( lib, "Ws2_32.lib")
#   endif
#endif
#define DEFAULT_PORT 19132
#define BUFFER_SIZE 1048 * 2
#include "./BinaryStream.h"
#include "Server.h"
#include <thread>
    class UDPSocket
    {
    private:
        bool isStarted;
#ifdef WIN32
        SOCKET sock;
        WSAData data;
#else
        int sock;
#endif
    public:
        bool isRuning;

    public:
        UDPSocket();
        UDPSocket(short port);
        UDPSocket(std::string ip);
        UDPSocket(std::string ip, short port, Server *server);
        ~UDPSocket();
        bool bind(std::string ip, short port);
        void receive();
        //int send(Packet*);
        void close();
        Server* server;
    };
#endif