Seaquel
SQL Server error code

SQL Server error 6224

SQL Server raises error 6224 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 field "%.*ls" of type "%.*ls.%.*ls" is marked with "System.NonSerializedAttribute". Native serialization types cannot have fields marked with "System.NonSerializedAttribute".
Msg6224
Severity16
Group6000–6999

Source: Database Engine events and errors