Seaquel
SQL Server error code

SQL Server error 493

SQL Server raises error 493 at severity 16, which marks a problem with the query or data that you can correct.

The column '%.*ls' that was returned from the nodes() method cannot be used directly. It can only be used with one of the four XML data type methods, exist(), nodes(), query(), and value(), or in IS NULL and IS NOT NULL checks.
Msg493
Severity16
Group0–999

Source: Database Engine events and errors