Seaquel
SQL Server error code

SQL Server error 2554

SQL Server raises error 2554 at severity 16, which marks a problem with the query or data that you can correct.

The index "%.*ls" (partition %ld) on table "%.*ls" cannot be reorganized because the filegroup is read-only.
Msg2554
Severity16
Group2000–2999

Source: Database Engine events and errors