Problem compiling IOS

Hi there, i’m new to ios, its my first attempt to cmpile an ios app. I’m getting the following error on xcode:

Undefined symbols for architecture armv7:
  "_kGADAdSizeSmartBannerPortrait", referenced from:
      -[GoogleMobileAdBanner InitBanner:bannerId:] in GoogleMobileAdBanner.o
  "_kGADAdSizeFullBanner", referenced from:
      -[GoogleMobileAdBanner InitBanner:bannerId:] in GoogleMobileAdBanner.o
  "_kGADAdSizeBanner", referenced from:
      -[GoogleMobileAdBanner InitBanner:bannerId:] in GoogleMobileAdBanner.o
  "_kGADAdSizeMediumRectangle", referenced from:
      -[GoogleMobileAdBanner InitBanner:bannerId:] in GoogleMobileAdBanner.o
  "_kGADAdSizeSmartBannerLandscape", referenced from:
      -[GoogleMobileAdBanner InitBanner:bannerId:] in GoogleMobileAdBanner.o
  "_kGADAdSizeLeaderboard", referenced from:
      -[GoogleMobileAdBanner InitBanner:bannerId:] in GoogleMobileAdBanner.o
  "_OBJC_CLASS_$_GADInterstitial", referenced from:
      objc-class-ref in GoogleMobileAdController.o
  "_OBJC_CLASS_$_GADRequest", referenced from:
      objc-class-ref in GoogleMobileAdController.o
  "_OBJC_CLASS_$_GADBannerView", referenced from:
      objc-class-ref in GoogleMobileAdBanner.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

How i get this to work?
Appreciate the help.

I have the same error when I add facebook adapter and admob mediation I resolve this by check “Link framework statically” on IOS Resolver Settings