Seaquel
SQL Server error code

SQL Server error 9956

SQL Server raises error 9956 at severity 16, which marks a problem with the query or data that you can correct.

SQL Server failed to logon the Full-Text filter daemon account '%ls' (Windows error code %d). The filter daemon process will not be started and full-text search functionality will not be available. Please make sure the account exists and is enabled.
Msg9956
Severity16
Group9000–9999

Source: Database Engine events and errors