Keep getting No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'

Question

I am trying to install my app on the emulator. According to docs, I should do this:

ant debug
adb install bin/MyFirstApp-debug.apk

But that ant debug is giving me this error:

No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.

I read some threads and did what they suggested. i.e.:

1. I checked that Android Support Repository is installed in SDK Manager.
2. Included the following in my build.gradle file:

compile 'com.android.support:appcompat-v7:22.2.0'
compile fileTree(include: ['*.jar'], dir: 'libs')

still get the same error.

How can I fix it?

UPDATE:

My styles.xml:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>