Errore al termine del build
Ciao, sarebbe bello se potessi scrivere qualcosa di più sul problema in inglese.
Sfortunatamente, è difficile per noi indovinare cosa sia successo, sulla base della grafica e delle descrizioni in italiano. 
At the end of the build of a face of the watch this window appears. The photo below is what is written on the log file.
Copy and paste it but it looks like there is an issue with the Certificates.
Ron
Samsung Developer Relations
I also had this message sometimes. My solution was to delete the aab files of the watch face in the folder “workspace” and made a new build.