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

You should compile your project with latest version so update & install from your SDK. Sync your project with sync project with Gradle file Button.
You can also continue with the existing version but check it installed properly below image indicate to API 22 that is properly installed.

And sync your project if needed.

it may help.