{10} Tickets to Triage, Prioritized

AmbiguousColumn: column reference "description" is ambiguous
LINE 5:    changetime AS _changetime, description AS _description,
                                      ^

SELECT COUNT(*) FROM (
SELECT p.value AS __color__,
   id AS ticket, summary, component, version, milestone,
   t.type AS type, severity, time AS created,
   changetime AS _changetime, description AS _description,
   reporter AS _reporter
  FROM ticket t
  LEFT JOIN enum p ON p.name = t.severity AND p.type = 'severity'
  WHERE ( t.status <> 'closed' AND t.status <> 'deleted' ) AND ( owner = 'nobody' OR owner is NULL OR owner = '' )
  ORDER BY severity DESC, p.value, milestone, t.type, time

) AS tab