Issue: Undefined symbols for architecture x86_64: "_kGADErrorDomain", referenced from: -[GADMAdapterNexage getInterstitial] in libAdMobMMAdapter.a(GADMAdapterNexage.o) -[GADMAdapterNexage getBannerWithSize:] in libAdMobMMAdapter.a(GADMAdapterNexage.o) -[GADMAdapterMillennial getInterstitial] in libAdMobMMAdapter.a(GADMAdapterMillennial.o) -[GADMAdapterMillennial getBannerWithSize:] in libAdMobMMAdapter.a(GADMAdapterMillennial.o) Caught: Migration of the pod 'Google-Mobile-Ads-SDK' from version 8.x to version 10.x