Facebook Login " Invalid App Id : 0 "

Hi!

I developed an android game " Uberman " that has login/share/invite functions.

My facebook script looks like this : using UnityEngine; using UnityEngine.UI; using System; using System.Collections; using System.Collections.Generic; using System.Linq;

public class Test : MonoBehaviour {

 public string status = "Ready";
 public string lastResponse = "";


 void Awake(){

 }
 
 void Start(){
             FB.Init (OnInitComplete, OnHideUnity);
             status = "FB.Init() called with " + FB.AppId;
             Debug.Log (status);
 }

 
     #region FB.Init() example
 
 private void OnInitComplete()
 {
     Debug.Log("FB.Init completed: Is user logged in? " + FB.IsLoggedIn);
 }
 
 private void OnHideUnity(bool isGameShown)
 {
     Debug.Log("Is game showing? " + isGameShown);
 }

 public void mm() {

     FB.Login("email", LoginCallback);
     }
 public void ShareWithFrinds()
 {
     FB.Feed (
         linkDescription: "Uberman wants to fly home  !!",
         linkCaption: "What's your HighScore?",
         picture: "http://www.expotehnica.ro/data_files/product_photos/1533/thumb_1.jpg",
         linkName: "Bored of killing pigs, flapping birds and crushing candy? Check this out, on Google Play !",
         link: "https://play.google.com/store/apps/details?id=com.MODgaming.UberMan"  + "/?challenge_brag=" + (FB.IsLoggedIn ? FB.UserId : "guest")
         //            link: "http://apps.facebook.com/" + FB.AppId + "/?challenge_brag=" + (FB.IsLoggedIn ? FB.UserId : "guest")
         );
 }
 
 public void InviteFriends()
 {
     FB.AppRequest (
         message: "Wanna play ?: ");
     
 }
     
 #endregion

 void LoginCallback(FBResult result)
 {
     if (result.Error != null) {

         lastResponse = "Error Response:\n" + result.Error;
                     Debug.Log (lastResponse);
             }
     else if (!FB.IsLoggedIn)
     {

         lastResponse = "Login cancelled by Player";
         Debug.Log(lastResponse);

     }
     else
     {

         lastResponse = "Login was successful!";
         Debug.Log(lastResponse);


 
     }
 }

}

In unity, it all works just fine. But on an android device, if i try to login, it opens Facebook and says Error " Invalid App Id : 0 ".

Has anybody encountered this ?