A Database Error Occurred

Error Number: 1054

Unknown column 'tags.slug' in 'field list'

SELECT `webshops__nav`.*, `tags`.`name`, `tags`.`slug` FROM (`webshops__nav`) JOIN `tags` ON `tags`.`id` = `webshops__nav`.`tag_id` WHERE `webshop_id` = 0 AND `webshops__nav`.`parent_id` IS NULL ORDER BY `order` asc

Filename: D:\www\xlbackoffice_codeigniter_intranet\codeigniter\system\database\DB_driver.php

Line Number: 329