No resource found - Theme.AppCompat.Light.DarkActionBar

Solution 1:

AppCompat is a library project. You need to reference the library project in your android project.

Check the topic Adding libraries with resources.

Update

Adding material theme should be the way. Check https://material.io/develop/android/docs/getting-started for more details.

Solution 2:

If you're using Eclipse, then add the reference library into your project as the following steps:

1. Right-click your project in the Project Explorer View.
2. Click Properties.
3. Click Android in the Properties window.
4. In the Library group, click Add...
   • See the image below.
5. Select the library. Click OK.
6. Click the OK button again in the Properties window.

Solution 3:

If you are using Android Studio then just add the dependency

dependencies {
     implementation 'com.android.support:appcompat-v7:25.0.1'
}

to app/build.gradle. And that will work