Seaquel
SQL Server error code

SQL Server error 9731

SQL Server raises error 9731 at severity 16, which marks a problem with the query or data that you can correct.

Dialog security is unavailable for this conversation because there is no security certificate bound to the database principal (Id: %i). Either create a certificate for the principal, or specify ENCRYPTION = OFF when beginning the conversation.
Msg9731
Severity16
Group9000–9999

Source: Database Engine events and errors