permissions setup Facebook app

Question

I tried many facebook codes to send invitation to my facebook friends this one is one of my tries

[FBWebDialogs presentRequestsDialogModallyWithSession:nil
>                                  message:@"Try this app called ..."
>                                     title:@"Invite to ..."
>                                      parameters:nil
>            handler:^(FBWebDialogResult result, NSURL *resultURL, NSError *error) {
>                            if (error) {
>                          // Case A: Error launching the dialog or sending request.
>                                    NSLog(@"Error sending request.");
>                        } else {
>                     if (result == FBWebDialogResultDialogNotCompleted) {
>                         // Case B: User clicked the "x" icon
>                       NSLog(@"User canceled request.");
>                          } else {
>                              NSLog(@"Request Sent.");
>                                   }
>                         }}];

the log give me the request send ...but nothing received Is it about the permissions setup in facebook app centre? what permissions shall I include there?

I hope I can find answer I look for days