Prime31 Game Center Plugin Problem, help please

When I build in Xcode, there are some error like this :

Undefined symbols:
“UnityGetGLViewController()”, referenced from:
-[GameCenterManager getViewControllerForModalPresentation:] in GameCenterManager.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

The only function I need in my app is show leaderboard and post score to leaderboard .
And I succeeded in building prime31’s test scene, but when I used it in my own scene, I always get this error when building in Xcode.
Anyone could please tell me what’s wrong with it.
Thank you very much!

Problem resolved, in my case the only prefab need in scene is GameCenterManager .