Seaquel
SQL Server error code

SQL Server error 6549

SQL Server raises error 6549 at severity 16, which marks a problem with the query or data that you can correct.

A .NET Framework error occurred during execution of user defined routine or aggregate '%.*ls': %ls. User transaction, if any, will be rolled back.
Msg6549
Severity16
Group6000–6999

Source: Database Engine events and errors