youtube errors

[VinC_HK]

Hi everyone,
I"m building an app about the youtube api
than here's the two header file I added.

#import "GDataYouTube.h"
#import "GDataServiceGoogleYouTube.h"

I didn't add any method yet and I tried to build,
and here's the error message.

Undefined symbols for architecture i386:
  "_SCNetworkReachabilityCreateWithName", referenced from:
      -[GDataOAuthSignIn startReachabilityCheck] in GDataOAuthSignIn.o
  "_SCNetworkReachabilitySetCallback", referenced from:
      -[GDataOAuthSignIn startReachabilityCheck] in GDataOAuthSignIn.o
      -[GDataOAuthSignIn stopReachabilityCheck] in GDataOAuthSignIn.o
  "_SCNetworkReachabilityScheduleWithRunLoop", referenced from:
      -[GDataOAuthSignIn startReachabilityCheck] in GDataOAuthSignIn.o
  "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from:
      -[GDataOAuthSignIn stopReachabilityCheck] in GDataOAuthSignIn.o
  "_SecItemCopyMatching", referenced from:
      -[GDataOAuthKeychain passwordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_SecItemDelete", referenced from:
      -[GDataOAuthKeychain removePasswordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_SecItemAdd", referenced from:
      -[GDataOAuthKeychain setPassword:forService:account:error:] in GDataOAuthViewControllerTouch.o
  "_kSecAttrAccount", referenced from:
      +[GDataOAuthKeychain keychainQueryForService:account:] in GDataOAuthViewControllerTouch.o
  "_kSecAttrGeneric", referenced from:
      +[GDataOAuthKeychain keychainQueryForService:account:] in GDataOAuthViewControllerTouch.o
  "_kSecAttrService", referenced from:
      +[GDataOAuthKeychain keychainQueryForService:account:] in GDataOAuthViewControllerTouch.o
  "_kSecClass", referenced from:
      +[GDataOAuthKeychain keychainQueryForService:account:] in GDataOAuthViewControllerTouch.o
  "_kSecClassGenericPassword", referenced from:
      +[GDataOAuthKeychain keychainQueryForService:account:] in GDataOAuthViewControllerTouch.o
  "_kSecMatchLimit", referenced from:
      -[GDataOAuthKeychain passwordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_kSecMatchLimitOne", referenced from:
      -[GDataOAuthKeychain passwordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_kSecReturnData", referenced from:
      -[GDataOAuthKeychain passwordForService:account:error:] in GDataOAuthViewControllerTouch.o
  "_kSecValueData", referenced from:
      -[GDataOAuthKeychain setPassword:forService:account:error:] in GDataOAuthViewControllerTouch.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

can anyone help me to see what happened?
This is my first time using youtube api.

[smithdale87]

Looks like you forgot to include a framework. Looks like SystemConfiguration