Seaquel
SQL Server error code

SQL Server error 6231

SQL Server raises error 6231 at severity 16, which marks a problem with the query or data that you can correct.

Type "%.*ls.%.*ls" is marked for native serialization, but one of its base types "%.*ls.%.*ls" is not valid for native serialization.
Msg6231
Severity16
Group6000–6999

Source: Database Engine events and errors