Seaquel
SQL Server error code

SQL Server error 6368

SQL Server raises error 6368 at severity 16, which marks a problem with the query or data that you can correct.

It is not allowed to specify an XSD type for selective XML index '%.*ls' because the column '%.*ls' of table '%.*ls' is associated with an XML Schema collection.
Msg6368
Severity16
Group6000–6999

Source: Database Engine events and errors