Seaquel
SQL Server error code

SQL Server error 1977

SQL Server raises error 1977 at severity 16, which marks a problem with the query or data that you can correct.

Could not create %S_MSG '%.*ls' on table '%.*ls'. Only XML Index can be created on XML column '%.*ls'.
Msg1977
Severity16
Group1000–1999

Source: Database Engine events and errors