inmobi ads not opening

I have incorporated inmobi ads in my android app.in my app i can see the ad from inmobi when i open the app. but when i click on the ad nothing happens. and i checked ddms which tells me this:

ActivityNotFoundException. no activity found to handle the intent

The following is my code snippet

imAdView = new IMAdView(this, IMAdView.INMOBI_AD_UNIT_320X50,"xxxxxxx(my app id kept secret)");
    RelativeLayout layout = (RelativeLayout)findViewById(R.开发者_JS百科id.adview);
    layout.addView(imAdView);
    imAdView.setIMAdRequest(adRequest);
    imAdView.loadNewAd();

do i need to import anything more??

I work for InMobi. That all looks ok, but it might be worth following our latest tutorial - http://developer.inmobi.com/wiki/index.php?title=Android