Seaquel
SQL Server error code

SQL Server error 3039

SQL Server raises error 3039 at severity 16, which marks a problem with the query or data that you can correct.

Cannot perform a differential backup for file '%ls' because a current file backup does not exist. Reissue BACKUP DATABASE omitting the WITH DIFFERENTIAL option.
Msg3039
Severity16
Group3000–3999

Source: Database Engine events and errors