Seaquel
SQL Server error code

SQL Server error 6842

SQL Server raises error 6842 at severity 16, which marks a problem with the query or data that you can correct.

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 convert it to binary, varbinary or image data type
Msg6842
Severity16
Group6000–6999

Source: Database Engine events and errors