Game center unavailable (player is not signed in ) - objective-c

Question

I am integrating game center on cocos2d project.
GKLeaderboardViewController* leaderboardController = [[GKLeaderboardViewController alloc] init];
if (leaderboardController != nil){
NSLog(#"view make");
leaderboardController.leaderboardDelegate = self;
leaderboardController.timeScope = GKLeaderboardTimeScopeAllTime;
leaderboardController.category = #"myGameBoard";
[[CCDirector sharedDirector] presentViewController: leaderboardController animated: YES completion:nil];
show popup
Game Center unavailable
Player is not signed in
and no leaderboard appeared.
My Conditions are
1)testuser looks successfully loginnd
this message appeared on screen.
Welcome back testuser
*** sandbox ***
2)then this message appeared
Game Center unavailable
Player is not signed in
3)App upload is ready and pass the validate on organizer
4)app version on itunes connect and local is the same 1.00
5)Bundle Idenfier on itunes connect and local is the same
6)leaderboardController.category name 'myGameBoard' is correctly set.
is there any other point I need to investigate??

Answer 1

I solved this problem for TEST MODE in this way:
Go to Game Center App
Tab Friends
Click Setting
at the end of the screen: SANDBOX and LOGGING MUST BE ON MODE
I hope that it works for everyone

Answer 2

I solved this issue by ensuring the local user was authenticated and logged in:
- (void) authenticateLocalUser
{
GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
if (![localPlayer isAuthenticated])
{
[localPlayer setAuthenticateHandler:(^(UIViewController* viewcontroller, NSError *error) {
if (!error && viewcontroller)
{
AppDelegate *appDelegate = (AppDelegate*) [[UIApplication sharedApplication] delegate];
UIViewController *currentViewController = [[appDelegate window] rootViewController];
[currentViewController presentViewController:viewcontroller animated:YES completion:nil];
}
})];
}
}