Android Studio, App throws java.lang.NoClassDefFoundError for ActionBarActivity

Question

I am using Android Studio and trying to use ActionBarActivity instead of Activity. Unfortunately when my main Activity tries to invoke ActionBarActivity I get an error:

Caused by: java.lang.NoClassDefFoundError:

I have added proper style to both activities:

android:theme="@style/Theme.AppCompat.Light">.

What am I missing, to have this working in Android Studio?

Answer 1

Adding the support and appcompat libraries to Gradle was not enough. I also had to add those libraries to Project structure as dependencies. This is confusing, because code compiles, but then crashes at runtime.