A Database Error Occurred

Error Number: 1054

Unknown column 'register.php' in 'where clause'

SELECT forum_category.category_id AS cid, forum_category.category_parent_id AS croot, forum_category.category_name AS cname, forum_category.category_status AS cstatus, forum_category.category_highlight AS chighlight, forum_category.category_descript AS cdescript, forum_category.category_topics AS all_topic, forum_category.category_posts AS all_post, forum_category.category_last_poster_id AS poster_id, forum_category.category_last_poster_name AS poster_name, forum_category.category_last_post_id AS post_id, forum_topics.topic_title AS post_name, forum_category.category_last_post_time AS post_time FROM forum_category LEFT JOIN forum_users ON forum_category.category_last_poster_id = forum_users.user_id LEFT JOIN forum_topics ON forum_category.category_last_post_id = forum_topics.topic_id WHERE forum_category.category_status>=1 AND (forum_category.category_parent_id=register.php OR forum_category.category_id=register.php) ORDER BY forum_category.category_parent_id, forum_category.category_id ASC