Ionic 3 Resolve! Failed to install ‘cordova-plugin-admob-free’: Error: Variable(s) missing: ADMOB_APP_ID

Here we will discuss an issue faced during the platform build of Ionic 3 application, having an AdMob Free plugin. You can see that error below, this issue comes when we don’t add AdMob app id in an application using AdMob Free Ionic 3 native Plugin.