Seaquel
SQL Server error code

SQL Server error 6817

SQL Server raises error 6817 at severity 16, which marks a problem with the query or data that you can correct.

FOR XML EXPLICIT cannot combine multiple occurrences of ELEMENT, XML, XMLTEXT, and CDATA in column name '%.*ls'.
Msg6817
Severity16
Group6000–6999

Source: Database Engine events and errors