分析我的应用程序时发生GData错误

当我运行我的应用程序，应用程序运行良好; 当我剖析我的应用程序，以下错误结果。

**Undefined symbols for architecture armv7: "_OBJC_CLASS_$_GDataQueryContact", referenced from: objc-class-ref in FetchContactFromEmailServer.o "_OBJC_CLASS_$_GDataServiceGoogleContact", referenced from: objc-class-ref in FetchContactFromEmailServer.o "_kGDataGoogleContactThinProjection", referenced from: -[FetchContactFromEmailServer contactFeedURL] in FetchContactFromEmailServer.o** 

我确定project->build settings->headersearchpath正确，因为应用程序运行良好。