Seaquel
SQL Server error code

SQL Server error 8671

SQL Server raises error 8671 at severity 16, which marks a problem with the query or data that you can correct.

The attempt to maintain the indexed view "%.*ls" failed because of the ignore_dup_key option on index "%.*ls". Drop the index or re-create it without the ignore_dup_key index option.
Msg8671
Severity16
Group8000–8999

Source: Database Engine events and errors