Cannot execute: 
			SELECT a.id, a.rewrite, a.position, a.is_external, a.navlocation, a.active, a.root_id, a.navlocation, b.title, b.content, b.meta_title, b.meta_desc, 
			b.meta_keywords, b.navigation_id 
			FROM tbl_navigation a
			INNER JOIN tbl_navigation_content b ON b.navigation_id=a.id  WHERE root_id= AND b.language_id=1  
			ORDER BY a.root_id, a.navlocation, b.language_id DESC, position ASC