I have the same problem, only in Sony Xperia MiniPro with Android 4.0.4
This is a new app. In older apps, I don't get this error, even with a new compilation.
Don't have 24 hours that I made the ads, but I tried with dummy IDs and get the same error.
The Google account is ok, because other apps uses the same account and in other devices the app don't crash.
The Google Play Services is updated and it in additional libraries folder.
I don't understand what's happen.
I have similars apps that works in same device and in other devices the app works fine.
Libs: AdMob, AnimationPlus, ContentResolver, Core, Dialogs, id, inAppBilling3, JavaObject, mwAdmobInterstitial2, Phone, PinchZoomAndMove, RandomAccessFile, Reflection, SQL, StringUtils
android:minSdkVersion="14" android:targetSdkVersion="19"
** Activity (main) Resume **
main_vvvvvvvvvvvvvvvvvvvvv6 (java line: 572)
java.lang.NoClassDefFoundError: android.support.v4.util.SimpleArrayMap
at com.google.android.gms.ads.internal.zzs.<init>(Unknown Source)
at com.google.android.gms.ads.internal.zzs.<init>(Unknown Source)
at com.google.android.gms.ads.internal.zzb.<init>(Unknown Source)
at com.google.android.gms.ads.internal.zzc.<init>(Unknown Source)
at com.google.android.gms.ads.internal.zzf.<init>(Unknown Source)
at com.google.android.gms.ads.internal.ClientApi.createBannerAdManager(Unknown Source)
at com.google.android.gms.ads.internal.client.zzl.createBannerAdManager(Unknown Source)
at com.google.android.gms.ads.internal.client.zze.zza(Unknown Source)
at com.google.android.gms.ads.internal.client.zzab.zzdh(Unknown Source)
at com.google.android.gms.ads.internal.client.zzab.zzdg(Unknown Source)
at com.google.android.gms.ads.internal.client.zzab.zza(Unknown Source)
at com.google.android.gms.ads.BaseAdView.loadAd(Unknown Source)
at com.google.android.gms.ads.AdView.loadAd(Unknown Source)
at anywheresoftware.b4a.admobwrapper.AdViewWrapper.LoadAd(AdViewWrapper.java:118)