Retrieve Facebook pages likes using custom login button

I have downloaded this sample project for custom login with Facebook:

FBLoginCustomUISample

and as a test I want to implement this method found on facebook sdk to retrive users pages likes:

/* make the API call */
[FBRequestConnection startWithGraphPath:@"/me/likes"
                             parameters:nil
                             HTTPMethod:@"GET"
                      completionHandler:^(
                          FBRequestConnection *connection,
                          id result,
                          NSError *error
                      ) {
                          NSLog(@"%@",result);
                      }];

I have copy-pasted it in the CustomLoginViewController.m like so:

- (IBAction)buttonTouched:(id)sender
{
  // If the session state is any of the two "open" states when the button is clicked
  if (FBSession.activeSession.state == FBSessionStateOpen
      || FBSession.activeSession.state == FBSessionStateOpenTokenExtended) {

    // Close the session and remove the access token from the cache
    // The session state handler (in the app delegate) will be called automatically
    [FBSession.activeSession closeAndClearTokenInformation];

  // If the session state is not any of the two "open" states when the button is clicked
  } else {
    // Open a session showing the user the login UI
    // You must ALWAYS ask for public_profile permissions when opening a session
    [FBSession openActiveSessionWithReadPermissions:@[@"public_profile"]
                                       allowLoginUI:YES
                                  completionHandler:
     ^(FBSession *session, FBSessionState state, NSError *error) {

       // Retrieve the app delegate
       AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
       // Call the app delegate's sessionStateChanged:state:error method to handle session state changes
       [appDelegate sessionStateChanged:session state:state error:error];
         [FBRequestConnection startWithGraphPath:@"/me/likes?limit=10"
                                      parameters:nil
                                      HTTPMethod:@"GET"
                               completionHandler:^(
                                                   FBRequestConnection *connection,
                                                   id result,
                                                   NSError *error
                                                   ) {
                                   NSLog(@"%@",result);
                               }];
     }];
  }

}

And I get returned an empty data when I LogIn.

Thanks for your help and please bare with me as this is my first attempt to work with the ios sdk.