Cannot resolve symbol 'Theme.AppCompat.Light.DarkActionBar' in styles.xml

Your build.gradle version is simply the wrong one.

Follow these instructions to fix that:

• In Android studio, go to the Gradle scripts section in the left panel.
• Find the file: build.gradle(Project:{your_project_name})
• In that file look at the line com.android.tools.build:gradle
• Check that the version match with your android studio version (for instance 2.3.3). This implies that com.android.tools.build:gradle:2.3.3 and And an Android studio distribution with 2.3.3 as version.
• Validate the versions are the same. If it's not the case, make sure they match.
• Rebuild the project and everything is fine!

Go to File > Close the Project. Then import it back and restart Android Studio.