OperationalError: ambiguous column name: description

SELECT COUNT(*) FROM (

SELECT p.value AS __color__,
   (CASE status WHEN 'accepted' THEN 'Accepted' ELSE 'Owned' END) AS __group__,
   id AS ticket, summary, component, version, milestone,
   t.type AS type, priority, time AS created,
   changetime AS _changetime, description AS _description,
   reporter AS _reporter
  FROM ticket t
  LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority'
  WHERE t.status <> 'closed' AND reporter = %s
  ORDER BY (status = 'accepted') DESC, CAST(p.value AS integer), milestone, t.type, time

) AS tab