Can't delete without CASCADE

message: 'update or delete on table "persons" violates foreign key constraint "training_jobs_person_pk_fkey" on table "training_jobs"'
}

ALTER TABLE public.training_jobs
DROP CONSTRAINT training_jobs_person_pk_fke,
ADD CONSTRAINT training_jobs_person_pk_fke
    FOREIGN KEY (person_pk)
    REFERENCES persons(person_pk)
    ON DELETE CASCADE;

Failed to run sql query: constraint "training_jobs_person_pk_fke" of relation "training_jobs" does not exist