Parse for iOS：try 运行应用程序时出错

我一直在使用Parse SDK，并且遵循了快速步骤指南.当我试图运行时，我得到了这8个错误.你知道为什么吗？它看起来像是与我没有使用的Parse的Facebook部分有关.

 Undefined symbols for architecture armv7:
"_FBTokenInformationTokenKey", referenced from:
  -[PFFacebookTokenCachingStrategy accessToken] in Parse(PFFacebookTokenCachingStrategy.o)
  -[PFFacebookTokenCachingStrategy setAccessToken:] in Parse(PFFacebookTokenCachingStrategy.o)
 "_FBTokenInformationExpirationDateKey", referenced from:
  -[PFFacebookTokenCachingStrategy cacheTokenInformation:] in     Parse(PFFacebookTokenCachingStrategy.o)
  -[PFFacebookTokenCachingStrategy expirationDate] in Parse(PFFacebookTokenCachingStrategy.o)
  -[PFFacebookTokenCachingStrategy setExpirationDate:] in Parse(PFFacebookTokenCachingStrategy.o)
 "_OBJC_METACLASS_$_FBSessionTokenCachingStrategy", referenced from:
  _OBJC_METACLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
"_OBJC_CLASS_$_FBSessionTokenCachingStrategy", referenced from:
  _OBJC_CLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationUserFBIDKey", referenced from:
  -[PFFacebookTokenCachingStrategy facebookId] in Parse(PFFacebookTokenCachingStrategy.o)
  -[PFFacebookTokenCachingStrategy setFacebookId:] in Parse(PFFacebookTokenCachingStrategy.o)
"_OBJC_CLASS_$_FBRequest", referenced from:
  objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSession", referenced from:
  objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
 ld: symbol(s) not found for architecture armv7
 clang: error: linker command failed with exit code 1 (use -v to see invocation)