admob ios7 error Audio framework
I am integrating admob SDK (the current) in my last application IOS7-Xcode5 and i have a new error (same on new project), i guess i missed something, but i restarted the process many times and the error is still here: Undefined symbols for architecture armv7: "_OBJC_CLASS_$_AVAudioSession", referenced from: objc-class-ref in libGoogleAdMobAds.a(GADDevice.o) "_AVAudioSessionPortHeadphones", referenced from: -[GADDevice audioRouteUsingAVAudioSession] in libGoogleAdMobAds.a(GADDevice.o) "_AVAudioSessionPortBuiltInSpeaker", referenced from: -[GADDevice audioRouteUsingAVAudioSession] in