Answer by TheBaj for Error retrieving parent for item: No resource found that matches the given name after upgrading to AppCompat v23

As others have already mentioned your compile sdk version must match your support library's major version. This is however, also relevant for subprojects should you have any.

In case you do, you can set your subprojects compile sdk versions with the following script:

subprojects { subproject ->
afterEvaluate{
    if((subproject.plugins.hasPlugin('android') || subproject.plugins.hasPlugin('android-library'))) {
        android {
            compileSdkVersion rootProject.ext.compileSdkVersion
            buildToolsVersion rootProject.ext.buildToolsVersion
        }
      }
   }
}

Add this script in your root build.gradle file.