Seaquel
SQL Server error code

SQL Server error 6841

SQL Server raises error 6841 at severity 16, which marks a problem with the query or data that you can correct.

FOR XML could not serialize the data for node '%.*ls' because it contains a character (0x%04X) which is not allowed in XML. To retrieve this data using FOR XML, convert it to binary, varbinary or image data type and use the BINARY BASE64 directive.
Msg6841
Severity16
Group6000–6999

Source: Database Engine events and errors