Seaquel
SQL Server error code

SQL Server error 6323

SQL Server raises error 6323 at severity 16, which marks a problem with the query or data that you can correct.

The xml schema collection for variable '%.*ls' has been altered while the batch was being executed. Remove all XML schema collection DDL operations it is dependent on from the batch, and re-run the batch.
Msg6323
Severity16
Group6000–6999

Source: Database Engine events and errors