Seaquel
SQL Server error code

SQL Server error 6226

SQL Server raises error 6226 at severity 16, which marks a problem with the query or data that you can correct.

Type "%.*ls.%.*ls" is marked for user-defined serialization, but does not implement the "%.*ls.%.*ls" interface.
Msg6226
Severity16
Group6000–6999

Source: Database Engine events and errors