Object reference not set

Hello Team,

I encounter Exception error on the image path when  saving data into the database, which says Object reference not set to an instance of the object, NOTE: I created the RoomImages folder in the repository folder. thanks

 

 public ActionResult saveRoom(RoomViewModel objRoomViewModel)
        {
            string message = String.Empty;
            string ImageUniqueName = String.Empty;
            string ActualImageName = String.Empty;
            if (objRoomViewModel.RoomId == 0)
            {
                 ImageUniqueName = Guid.NewGuid().ToString();
                ActualImageName = ImageUniqueName + Path.GetExtension(objRoomViewModel.Image.FileName);

                objRoomViewModel.Image.SaveAs(filename: Server.MapPath("~/Repositories/RoomImages/" + ActualImageName));
                Room objRoom = new Room()
                {
                    RoomNumber = objRoomViewModel.RoomNumber,
                    RoomDescription = objRoomViewModel.RoomDescription,
                    RoomPrice = objRoomViewModel.RoomPrice,
                    BookingStatusId = objRoomViewModel.BookingStatusId,
                    IsActive = true,
                    RoomImage = ActualImageName,
                    RoomCapacity = objRoomViewModel.RoomCapacity,
                    RoomTypeId = objRoomViewModel.RoomTypeId
                };

                objHotelDbEntities.Rooms.Add(objRoom);               
                return Json(new {message = "Room successfully Updated.", success = true }, JsonRequestBehavior.AllowGet);
               
            }

            else
            {
                Room objRoom = objHotelDbEntities.Rooms.Single(model => model.RoomId == objRoomViewModel.RoomId);
                if (objRoomViewModel.Image != null)
                {
                    ImageUniqueName = Guid.NewGuid().ToString();
                    ActualImageName = ImageUniqueName + Path.GetExtension(objRoomViewModel.Image.FileName);
                    objRoomViewModel.Image.SaveAs(filename: Server.MapPath("~/RoomImages/" + ActualImageName));
                    objRoom.RoomImage = ActualImageName;
                }
                objRoom.RoomNumber = objRoomViewModel.RoomNumber;
                objRoom.RoomDescription = objRoomViewModel.RoomDescription;
                objRoom.RoomPrice = objRoomViewModel.RoomPrice;
                objRoom.BookingStatusId = objRoomViewModel.BookingStatusId;
                objRoom.IsActive = true;
                objRoom.RoomCapacity = objRoomViewModel.RoomCapacity;
                objRoom.RoomTypeId = objRoomViewModel.RoomTypeId;
                message = "Updated successfully";
            }
            objHotelDbEntities.SaveChanges();
            return Json(new { message = "Room successfully saved." + message, success = true }, JsonRequestBehavior.AllowGet);

        }