The following classes could not be found: android.support.v7.internal.app.WindowDecorActionBar

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The Actionbar has been deprecated and replaced by Toolbar. That being said, you can do the following if you want to continue using Actionbar for now:

  1. Open styles.xml in the values folder inside the res folder.
  2. Add the word Base to the beginning of the theme name so that it reads “Base.Theme.AppCompat.Light.DarkActionBar”

enter image description here

I had the same issue today and this solution worked for me. FYI I am in Android Studio though, but hopefully,the solution is similar for Eclipse.

FYI here is a decent blog post on replacing the Actionbar with the Toolbar for when you are ready to do so: https://blog.xamarin.com/android-tips-hello-toolbar-goodbye-action-bar/

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