When do you get the error message, sometimes is not very precise? After the call of the showAdPopup or without calling the showAdPopup at all? You need to be exact at your problem definition to get any help. Just throwing in the source and the logcat with one sentence is not enough (for most cases).
Are you sure it's related to the AdView, because on my old Galaxy S1 (android 2.3.4) SFML example app crashes with nearly the exact same error message.
AlexUT