question

I am new to PlayFab community, just started exploring with Unity.

i was folling up your unity tutorial for login and it seems i am doing something wrong, i am unable to log-in.

here is my code piece - 


using UnityEngine;
using System.Collections;
using PlayFab;
using PlayFab.ClientModels;

public class Test : MonoBehaviour
{
    public string PlayFabId;

    void Start ()
    {
        Login ("user");
    }

    void Login (string titleId)
    {
        LoginWithCustomIDRequest request = new LoginWithCustomIDRequest () {
            TitleId = titleId,
            CreateAccount = true,
            CustomId = SystemInfo.deviceUniqueIdentifier
        };

        PlayFabClientAPI.LoginWithCustomID (request, (result) => {
            PlayFabId = result.PlayFabId;
            Debug.Log ("Got PlayFabID: " + PlayFabId);

            if (result.NewlyCreated) {
                Debug.Log ("(new account)");
            } else {
                Debug.Log ("(existing account)");
            }
        },
            (error) => {
                Debug.Log ("Error logging in player with custom ID:");
                Debug.Log (error.ErrorMessage);
            });
    }
  
}

I am getting- Invalid input parameters,

BTW - i have  changed  TitleId in PlayFabSettings.cs

do i need to put my secret key and api key somewhere ?

please help.

thanks