Seaquel
SQL Server error code

SQL Server error 6336

SQL Server raises error 6336 at severity 16, which marks a problem with the query or data that you can correct.

Maximum size of primary index of table '%.*ls' is %d bytes. CREATE XML INDEX requires that such size should be limited to %d bytes
Msg6336
Severity16
Group6000–6999

Source: Database Engine events and errors