If you had already setup your server and configured libraries it might be worth to attempt repairing that corrupted database.
https://support.plex.tv/articles/repair-a-corrupted-database/
If this was a new server or you had spent very little effort, you can alternatively wipe the server data directory and start over.
https://support.plex.tv/articles/201198426-restart-plex-media-server-setup-from-scratch/
