Golang reset service post method post data undefined

hi i am working with google golang reset service i have issue with post method
when i try to run this code it show post data undefined

    package main

import (
	"code.google.com/p/gorest"
	"fmt"
	"net/http"
)

type Invitation struct {
	User string
}

//Service Definition
type HelloService struct {
	gorest.RestService
	//gorest.RestService `root:"/tutorial/"`
	helloWorld gorest.EndPoint `method:"GET" path:"/hello-world/" output:"string"`
	sayHello   gorest.EndPoint `method:"GET" path:"/hello/{name:string}" output:"string"`
	posted     gorest.EndPoint `method:"POST" path:"/post/"  postdata:"User" `
}

func main() {
	gorest.RegisterService(new(HelloService)) //Register our service
	http.Handle("/", gorest.Handle())
	http.ListenAndServe(":8787", nil)
}

func (serv HelloService) Posted(posted User) {
	fmt.Println(User)
}

func (serv HelloService) HelloWorld() string {
	return "Hello World"
}
func (serv HelloService) SayHello(name string) string {
	return "Hello " + name
}

this is the error i am getting

# command-line-arguments
./registation.go:28: undefined: User
./registation.go:29: undefined: User

please help to fix this issue
thank you

func (serv HelloService) Posted(posted User) {
    fmt.Println(User)
}

should be

func (serv HelloService) Posted(posted User) {
    fmt.Println(posted)
}

The posted method takes a parameter with the name of posted and type of User.

You should be printing the actual paramater, not it's type - Just like you have here

func (serv HelloService) SayHello(name string) string {
    return "Hello " + name
}

        package main
import (
//"bytes"
"code.google.com/p/gorest"
"crypto/rand"
"crypto/tls"
//"encoding/json"
"fmt"
"log"
"net"
"net/http"
"net/mail"
"net/smtp"
)
type InvitEmail struct {
SenderEmail   string
ReceiverEmail string
}
//Service Definition
type HelloService struct {
gorest.RestService
//gorest.RestService `root:"/tutorial/"`
helloWorld   gorest.EndPoint `method:"GET" path:"/hello-world/" output:"string"`
sayHello     gorest.EndPoint `method:"GET" path:"/hello/{name:string}" output:"string"`
userRegister gorest.EndPoint `method:"POST" path:"/UserRegister/" postdata:"InvitEmail"`
/*activate     gorest.EndPoint `method:"GET" path:"/activate/{email:string}/{token:string}" output:"bool"`
userInvite   gorest.EndPoint `method:"POST" path:"/UserInvite/" postdata:"InvitEmail"`*/
}
func main() {
gorest.RegisterService(new(HelloService)) //Register our service
http.Handle("/", gorest.Handle())
http.ListenAndServe(":8787", nil)
}
func (serv HelloService) UserRegister(u InvitEmail) {
fmt.Println(u.ReceiverEmail, "xxxxxxxx", u.SenderEmail)
invitationmail(u.SenderEmail, u.ReceiverEmail)
serv.ResponseBuilder().SetResponseCode(200).Write([]byte("from :" + u.SenderEmail + "      to :" + u.ReceiverEmail))
}
func (serv HelloService) HelloWorld() string {
return "Hello World"
}
func (serv HelloService) SayHello(name string) string {
return "Hello " + name
}
func invitationmail(sender, receiver) {
//emailsendingpart
}