sempre event

[vincenzo (enzojoomla)]

ho scaricato questa event da qui  http://www.joomlaresource.com/index.php?option=com_remository&Itemid=2&func=fileinfo&id=137

quando voglio aggiunger un evento dopo aver creato la categoria mi da questo come messaggio:

Unknown column \'a.checked_out\' in \'on clause\' SQL=SELECT a.*, cc.name AS category, u.name AS editor, g.name AS groupname\nFROM jos_events AS a, jos_categories AS cc\nLEFT JOIN jos_users AS u ON u.id = a.checked_out\nLEFT JOIN jos_groups AS g ON g.id = a.access\nWHERE a.catid=\'16\' AND a.catid=cc.id\nORDER BY a.catid\nLIMIT 0,30

Cosa devo fare..please Carneade