erro no WHERE tipo = 'post' AND tipo = 'ator'

people tenho esse codigo que faz um where

WHERE tipo = 'post'

Agora apliquei

WHERE tipo = 'ator'

ele simplersmente da erro

$readSlide = read('(SELECT * FROM up_posts ORDER BY data DESC) up_posts',"WHERE tipo = 'post' AND status = '1' GROUP BY cat_pai ORDER BY data DESC LIMIT 4");

foreach($readSlide as $slide):

$readSlide = read('(SELECT * FROM up_posts ORDER BY data DESC) up_posts',"WHERE tipo = 'post' AND tipo = 'ator' AND status = '1' GROUP BY cat_pai ORDER BY data DESC LIMIT 4");

foreach($readSlide as $slide):