Seaquel
SQL Server error code

SQL Server error 6843

SQL Server raises error 6843 at severity 16, which marks a problem with the query or data that you can correct.

FOR XML EXPLICIT: XML data types and CLR types cannot be processed as CDATA in column name '%.*ls'. Consider converting XML to a string type. Consider converting CLR types to XML and then to a string type.
Msg6843
Severity16
Group6000–6999

Source: Database Engine events and errors