{6} All Tickets By Milestone (Including closed)

ProgrammingError: column "modified" does not exist
LINE 17:         (CASE status WHEN 'closed' THEN modified ELSE (-1)*p...
                                                 ^

SELECT COUNT(*) FROM (

SELECT p.value AS __color__,
   t.milestone AS __group__,
   (CASE status 
      WHEN 'closed' THEN 'color: #777; background: #ddd; border-color: #ccc;'
      ELSE 
        (CASE owner WHEN ''||%s||'' THEN 'font-weight: bold' END)
    END) AS __style__,
   id AS ticket, summary, component, status, 
   resolution,version, t.type AS type, priority, owner,
   changetime AS modified,
   time AS _time,reporter AS _reporter
  FROM ticket t,enum p
  WHERE p.name=t.priority AND p.type='priority'
  ORDER BY (milestone IS NULL), milestone DESC, (status = 'closed'), 
        (CASE status WHEN 'closed' THEN modified ELSE (-1)*p.value END) DESC

) AS tab