Database Error; SQL: SELECT DISTINCT `t`.* FROM `mc_posts` AS `t` WHERE ( ( `resource_category`.`slug`='deliverables' ) AND ( `t`.`post_type` = 'resource' ) AND ( `t`.`post_status` IN ( 'publish' ) ) ) ORDER BY `t`.`post_date` DESC, `t`.`menu_order`, `t`.`post_title`, `t`.`post_date`; Response: Unknown column 'resource_category.slug' in 'where clause'