Seaquel
SQL Server error code

SQL Server error 4997

SQL Server raises error 4997 at severity 16, which marks a problem with the query or data that you can correct.

Cannot enable change tracking on table '%.*ls'. Change tracking requires a primary key on the table. Create a primary key on the table before enabling change tracking.
Msg4997
Severity16
Group4000–4999

Source: Database Engine events and errors