No resource found that matches the specified name "Theme.AppCompat.Light.DarkActionBar"

For me, the solution involved recreating the Android v7 Application Compatibility Support Library (appcompat):

• Create a new library android-support-v7-appcompat
  
  following the instructions on the Android Developer Support Library setup page. Note. I had to manually modify the file project.properties
  
  to build the new library. Change target=android-19
  
  to target=android-21
  
  .
• Explicitly add this new library android-support-v7-appcompat
  
  to your problematic project:
• After that, the project properties should look something like this:

The project should now compile. It's a long road, but it worked for me.

An interesting side effect of all this work is that when I created my next project, Eclipse automatically created a new library project appcompat_v7

, adding it to my workspace, and suddenly everything was back to normal. I probably did something different, but I just couldn't figure out what else. Anyway, I finally got my project to compile, and in the process it seems like I reset something in the Eclipse ADT.

Hope this helps.