Xml parsing error: unbound prefix from com.google.android.gms.ads.AdView

Question

<com.google.android.gms.ads.AdView
        xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
        xmlns:ads="http://schemas.android.com/apk/res-auto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        ads:adUnitId="**************"
        ads:adSize="BANNER"
        ads:loadOnCreate="true"
        android:id="@+id/adView"/>

I have this code here, with xmlns: declarations, but still getting an unbound prefix error and requiring the XML attribute "adsize" to be absent.