There are 2 SQL 'agents' that backup database transaction logs for Unity.
One runs on a nightly basis and the other on a weekly basis (on Sundays).
It's possible the first week before the weekly agent job completes that real error events will show up in the application log - these will be replaced by the 'error' events reported above after the weekly job runs and the nightly job has something to back up to.
Otherwise, this is reporting success with truncating the db log, which SQL happens to throw as an 'Error' Event Type.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.