Getting following error while calling the PUT method in web API?

1]The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Net.Http.HttpResponseMessage Put(Int32, ClassLibrary2.Employee)' in 'EmployeeService.Controllers.EmployeeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.

2]Second Error I am getting ID values as 0

Please refer Following COde:-

public HttpResponseMessage Put([FromBody]int id, [FromUri]Employee employee)
        {
            try
            {
                using (EmployeeDBEntities entities = new EmployeeDBEntities())
                {
                    var entity = entities.Employees.FirstOrDefault(e => e.ID == id);
                    if (entity == null)
                    {
                        return Request.CreateErrorResponse(HttpStatusCode.NotFound,
                            "Employee with Id " + id.ToString() + " not found to update");
                    }
                    else
                    {
                        entity.FirstName = employee.FirstName;
                        entity.LastName = employee.LastName;
                        entity.Gender = employee.Gender;
                        entity.Salary = employee.Salary;

                        entities.SaveChanges();

                        return Request.CreateResponse(HttpStatusCode.OK, entity);
                    }
                }
            }
            catch (Exception ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
            }
        }

public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services

            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            config.Formatters.JsonFormatter.SerializerSettings.Formatting = Newtonsoft.Json.Formatting.Indented;
            config.Formatters.JsonFormatter.SerializerSettings.ContractResolver= new CamelCasePropertyNamesContractResolver();
        }