Seaquel
SQL Server error code

SQL Server error 6870

SQL Server raises error 6870 at severity 16, which marks a problem with the query or data that you can correct.

Prefix '%.*ls' used in WITH XMLNAMESPACES clause contains an invalid XML identifier. '%c'(0x%04X) is the first character at fault.
Msg6870
Severity16
Group6000–6999

Source: Database Engine events and errors