I've got the following code running to create and iAds AdView:

if (parseFloat(Ti.Platform.version) >= 4.0) {
            var adView = Ti.UI.iOS.createAdView({
                width: 'auto',
                height: 'auto',
                top: -100,
                borderColor: '#000000',
                backgroundColor: '#000000'
            });
            win.add(adView);
        }

I'm getting the following error:

Result of expression 'Ti.UI.iOS.createAdView' [undefined] is not a function'...

It doesn't happen all the time though, sometimes I see the test ad as expected.

Any ideas on why this is happening? I'm checking for the right iOS version. (In fact, isn't iAds supported in 3.2?)