Error displaying the error page: Could not connect to MySQL.:  SQL=SELECT DISTINCT(user_id)
FROM #__usergroups as ug1
INNER JOIN #__usergroups AS ug2 ON ug2.lft>=ug1.lft AND ug1.rgt>=ug2.rgt
INNER JOIN #__user_usergroup_map AS m ON ug2.id=m.group_id
WHERE ug1.id='6'