Seaquel
SQL Server error code

SQL Server error 3258

SQL Server raises error 3258 at severity 16, which marks a problem with the query or data that you can correct.

The volume on the device "%ls" is not part of the media set that is currently being processed. Ensure that the backup devices are loaded with the correct media.
Msg3258
Severity16
Group3000–3999

Source: Database Engine events and errors