I have followed an admob tutorial to add an admob banner to my application (this one http://www.wikihow.com/Add-Advertisements-to-Your-Android-Applications-Using-Admob)
I add it using the following code
<com.google.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adSize="BANNER"
ads:adUnitId="a151ebd8dece188"
ads:loadAdOnCreate="true" >
</com.google.ads.AdView>
I also have in my manifest
<activity android:name="com.google.ads.AdActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />
</application>
and also
However, whenever I open this view on the app it crashes. I have looked at many admob questions on here but cannot find anything obvious missing from my code. Is it something simple that I am missing?