Seaquel
SQL Server error code

SQL Server error 667

SQL Server raises error 667 at severity 16, which marks a problem with the query or data that you can correct.

The index "%.*ls" for table "%.*ls" (RowsetId %I64d) resides on a filegroup ("%.*ls") that cannot be accessed because it is offline, is being restored, or is defunct.
Msg667
Severity16
Group0–999

Source: Database Engine events and errors