отсутствует необходимая архитектура armv7 в файле?

Я продолжаю получать это предупреждение и ошибки кто-нибудь может помочь?

    ld: warning: ignoring file /Applications/Xcode.app/Contents/Developer/Platforms       /iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk/System/Library/Frameworks//SystemConfiguration.framework/SystemConfiguration, missing required architecture armv7 in file
    Undefined symbols for architecture armv7:
    "_SCNetworkReachabilityCreateWithAddress", referenced from:
  +[Reachability reachabilityWithAddress:] in Reachability.o
   "_SCNetworkReachabilityCreateWithName", referenced from:
  +[Reachability reachabilityWithHostName:] in Reachability.o
   "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from:
  -[Reachability stopNotifier] in Reachability.o
   "_SCNetworkReachabilityScheduleWithRunLoop", referenced from:
  -[Reachability startNotifier] in Reachability.o
   "_SCNetworkReachabilitySetCallback", referenced from:
  -[Reachability startNotifier] in Reachability.o
   "_SCNetworkReachabilityGetFlags", referenced from:
  -[Reachability connectionRequired] in Reachability.o
  -[Reachability currentReachabilityStatus] in Reachability.o
   ld: symbol(s) not found for architecture armv7
   clang: error: linker command failed with exit code 1 (use -v to see invocation)

Мое приложение отлично работает в Симуляторе. Я не понимаю этого, просто когда я собираю его на телефон.