Issues with Loading AdMob Ads on App Android google ads error (null reference ?) Error java.lang.RuntimeException: Unable to start activity ComponentInfo{com.domain.sub/com.domain.sub.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.AdView.loadAd(com.google.android.gms.ads.AdRequest)' on a null object reference 해당 activity 에서 R.id.a..
