Seaquel
SQL Server error code

SQL Server error 435

SQL Server raises error 435 at severity 16, which marks a problem with the query or data that you can correct.

Xml data type methods are not supported in computed column definitions. Create a scalar user-defined function to wrap the method invocation. The error occurred at column "%.*ls", table "%.*ls", in the %ls statement.
Msg435
Severity16
Group0–999

Source: Database Engine events and errors