Sorry to disturbe!
I did as you say and i can export my .apk and i now have:
Start deviceReady Run Javascript:
window.admob.createBannerView (
{
'PublisherID': '[xxxxxxxxxxxxxx]',
'AdSize': admob.AD_SIZE.BANNER
},
successCallback,
failureCallback
);
I can now run my app and i don't get the "spinning wheel" anymore but no ad-banner is showing =(