Errors Of GData occurs when profiling my app

when I run my app, the App runs fine;
when I profile my app, the following errors turns out.

**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**

I’m sure of project->build settings->header search path correct, because App runs fine.

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