Seaquel
SQL Server error code

SQL Server error 4017

SQL Server raises error 4017 at severity 16, which marks a problem with the query or data that you can correct.

Neither the language requested in 'login %.*ls' nor user default language %.*ls is an official language name on this SQL Server. Using server-wide default %.*ls instead.
Msg4017
Severity16
Group4000–4999

Source: Database Engine events and errors