NetWorker vProxy Backup Common error messages

Hello , Currently we are trying to identify list of normal/frequent issues that might happen on vProxy backups using networker 9.2 and networker 18.X so that we can document those errors and create a KB internally . I know the error message guide might include few of vmware backup issues but our focus is mainly on Networker Vproxy alone . Any update at the earliest would be highly appreciated .. Best Regards Karthik