Seaquel
SQL Server error code

SQL Server error 6868

SQL Server raises error 6868 at severity 16, which marks a problem with the query or data that you can correct.

The following FOR XML features are not supported with WITH XMLNAMESPACES list: EXPLICIT mode, XMLSCHEMA and XMLDATA directives.
Msg6868
Severity16
Group6000–6999

Source: Database Engine events and errors