[Boost-users] new user got compile error

Just started using Boost. Socket only right now. Created one small class but cannot compile. Please help. Compile error is In file included from Server.cpp:8: ./include/Server.h:26: error: ‘io_service’ is not a type ./include/Server.h:26: error: expected unqualified-id before ‘(’ token ./include/Server.h:26: error: expected `)' before ‘(’ token ./include/Server.h:26: error: expected ‘,’ or ‘...’ before ‘(’ token ./include/Server.h:26: error: expected ‘;’ before ‘)’ token ./include/Server.h:27: error: ‘io_service’ is not a type ----- My header file: /* * Server.h * * Created on: Dec 1, 2008 * Author: */ #ifndef SERVER_H_ #define SERVER_H_ #include class Server{ public: Server(){}; ~Server(){}; void print(); protected: private: boost::asio::io_service io_service; boost::asio::ip::tcp::acceptor acceptor(io_service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), 13)); boost::asio::ip::tcp::socket asio_socket(io_service); boost::system::error_code error_read; }; #endif /* SERVER_H_ */ ----- My cpp file: /* * Server.cpp * * Created on: Dec 1, 2008 * Author: */ #include "Server.h" void Server::print(){ }