Seaquel
SQL Server error code

SQL Server error 5551

SQL Server raises error 5551 at severity 16, which marks a problem with the query or data that you can correct.

FILESTREAM file '%.*ls' cannot be added because its destination filegroup cannot have more than one file. Specifying more than one Filestream Container per Filestream Filegroup is not supported in this edition of SQL Server. See Books Online for more details on feature support in different SQL Server editions.
Msg5551
Severity16
Group5000–5999

Source: Database Engine events and errors