I had a hard time trying to build my project with AdmobFullscreen.cn1lib installed. I finally got it with your help in the chat.
The problem now is that the app crashes right at the start. I downloaded the sources and found this error in Xcode:
diff: /Podfile.lock: No such file or directory
diff: /Manifest.lock: No such file or directory
error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.
I don't know if that makes sense.
These are some lines in my build hints. Let me know if you need them all:
codename1.arg.ios.pods=,GoogleMaps ${var.ios.pods.GoogleMaps.version\:2.6.0},Firebase/Core,Firebase/AdMob
codename1.arg.ios.add_libs=;EventKit.framework;AdSupport.framework;SystemConfiguration.framework;CoreTelephony.framework
codename1.arg.ios.pods.platform=,7.0,9.0