ORDER BY not working with UNION ALL

[Cheyenne Forbes]

 I get "Undefined column family. familyName=f" whenever I run the following
query,it works without the ORDER BY and works with the ORDER BY if its not
a union and just one select statement

       SELECT
              p.name
        FROM
              person p
        JOIN
              friends f
        ON
              f.person = p.id
        WHERE
              567 != ANY(f.persons)
UNION ALL
        SELECT
              p.name
        FROM
              person p
        JOIN
              friends f
        ON
              f.person = p.id
        WHERE
              123 != ANY(f.persons)
        ORDER BY f.date_time LIMIT 20

Regards,

Cheyenne O. Forbes