Description
You need to have Wear OS 5 and the app "1Smart - Core for WatchFaces" previously installed.
https://play.google.com/store/apps/details?id=com.rx7ru.aewatchface
Without these conditions, you will only see the warning text.
Tap to install the 1smart core service, then reinstall this watch face again to get the classic look of good old 1Smart.