Error due to action bar activity

The appcompat themes remove the native ActionBar and use the support ActionBar.

You need to change

extends Activity

To

extends ActionBarActivity

You also need to change Base.Theme.AppCompat.Light to Theme.AppCompat.Light in your AndroidManifest.

Please see this blog post for more information: http://android-developers.blogspot.com/2014/10/appcompat-v21-material-design-for-pre.html