Prime31 gamecenterPlugins Can not work!

I used prime31 game center Plugins in my project work on IOS 4.1 or later is well,

but crash on IOS 4.0 or earlyer (note : I know those IOS not support Game center ,but ,I think if I not Call Game conter API .the project should run well , but the fact is Cashed on loading sence)??

why?

excuse me english is not well.

GameCenter_2011-10-05.unitypackage is my plugin VER.

I had this problem with Xcode 3. GameKit was not been weak linked in Xcode. You need to find GameKit.framework in Info and change it from Required to Optional.

I have since upgraded to Xcode 4 and it works fine there.

http://forum.unity3d.com/threads/100882-Prime31-Gamecenter-Plugin-doesn-t-run-in-iOS-3.2?highlight=GameCenter