Illegal: the query did not contain exactly one element:
SELECT title, description, location, clearance, mod_calendar.id, ninera_project_id, ninera_registration_settings_id, YEAR(start) AS start_year, DATE_FORMAT(start,'%m') AS start_month, DATE_FORMAT(start,'%d') AS start_day, WEEKDAY(start) AS start_weekday, DATE_FORMAT(start,'%Y-%m-%d') AS start_date, DATE_FORMAT(start,'%Y-%m-%d %k:%i') AS start_datetime, DATE_FORMAT(start,'%k') AS start_hour, DATE_FORMAT(start,'%i') AS start_minute, YEAR(end) AS end_year, DATE_FORMAT(end,'%m') AS end_month, DATE_FORMAT(end,'%d') AS end_day, DATE_FORMAT(end,'%Y-%m-%d') AS end_date, DATE_FORMAT(end,'%Y-%m-%d %k:%i') AS end_datetime, WEEKDAY(end) AS end_weekday, DATE_FORMAT(end,'%k') AS end_hour, DATE_FORMAT(end,'%i') AS end_minute FROM mod_calendar LEFT JOIN mod_calendar_languages ON mod_calendar.id = mod_calendar_languages.calendar_id WHERE mod_calendar.website_id=161 AND language_id=1 AND published='true' AND slug='werelddag-van-de-stedenbouw' LIMIT 0,1

/var/www/h10575/sites/cms/htdocs/ci.php