[Help] Make Npc Sell Items

[nuhali]

                    case 7310: //Stuff
                    {
                        if (LinkBack == 0)
                        {
                            Text("Hello I selling some stuff!", CSocket);
                            Link("Moonbox for 2kk gold", 1, CSocket);
                            Link("Emerald for 50k gold", 2, CSocket);
                            Link("+7 Stone for 300kk", 3, CSocket);
                            Link("+8 Stone for 400kk", 4, CSocket);
                            Link("No Thank you I dont need.", 255, CSocket);
                            End(CSocket);
                            }
                            else if (LinkBack == 1) //Moonbox
                            {
                            if (CSocket.Client.Money >= 1)
                            {
                                AddItem(721090, 0, 0, 0, 0, 0, 0, 0, 0, CSocket);
                                Money(-2000000, CSocket);
                            }
                            else if (LinkBack == 2) //Emerald
                            {
                                AddItem(1080001, 0, 0, 0, 0, 0, 0, 0, 0, CSocket);
                                Money(-50000, CSocket);
                            }
                            else if (LinkBack == 3) //+7 stone
                            {
                                AddItem(730007, 0, 0, 0, 0, 0, 0, 0, 0, CSocket);
                                Money(-300000000, CSocket);
                            }
                            else if (LinkBack == 4) //+8 stone
                            {
                                AddItem(730008, 0, 0, 0, 0, 0, 0, 0, 0, CSocket);
                                Money(-400000000, CSocket);
                            }
                        }
                        break;
                    }

can any help me how to fix this