Таблица 'roma-ruslanovich.cms_con_posts' не существует
SELECT i.*, f.title as `folder_title`, u.nickname as `user_nickname`, u.slug as `user_slug`, u.is_deleted as `user_is_deleted`, u.groups as `user_groups`, u.avatar as `user_avatar`
FROM cms_con_posts i
INNER JOIN cms_users as u ON u.id = i.user_id
LEFT JOIN cms_content_folders as f ON f.id = i.folder_id
WHERE (i.id = '18704')
LIMIT 1