Google Play Services Leaderboard not working

I have a problem implementing the Leaderboards. Login works just fine, but when I try to show the leaderboards I get :

"Trying to show UI while waiting for a result from an existing UI. Please ensure that OnActivityResulty is forwarded to the Games C++ SDK from your Java activity. See android.suport.h for more details."

This is my method for showing(attached on a button) :

public void ShowLeaderboardsUI()
{
PlayGamesPlatform.Instance.ShowLeaderboardUI("myString");
}

I already added to my manifest the :

< activity android:name="com.google.games.bridge.NativeBridgeActivity" android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen" />

Thanks !

 

same issue for me