AdWhirl Implementation error

I have a blank xcode document and trie to implement AdWhirl, when I buld it, I have this errors.

Undefined symbols:
  "_SCNetworkReachabilityScheduleWithRunLoop", referenced from:开发者_如何学运维
      -[AWNetworkReachabilityWrapper scheduleInCurrentRunLoop] in AWNetworkReachabilityWrapper.o
  "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from:
      -[AWNetworkReachabilityWrapper unscheduleFromCurrentRunLoop] in AWNetworkReachabilityWrapper.o
  "_SCNetworkReachabilityCreateWithName", referenced from:
      -[AWNetworkReachabilityWrapper initWithHostname:callbackDelegate:] in AWNetworkReachabilityWrapper.o
  "_SCNetworkReachabilitySetCallback", referenced from:
      -[AWNetworkReachabilityWrapper initWithHostname:callbackDelegate:] in AWNetworkReachabilityWrapper.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

I need some help, thanks

you are missing the SystemConfiguration.framework. Add it, and check that you have the other required frameworks too.

From the AdWhirl iOS SDK Setup Instructions:

Add the system frameworks required by the supported ad networks:

AddressBook
AudioToolbox
AVFoundation
CoreLocation
libsqlite3
libz
MapKit

The following additional frameworks are required by the iAd adapter:

iAd
QuartzCore
SystemConfiguration

Add The "SystemConfiguration.framework" framework from existing framework.