ERROR Parsing JOIN

[zxdxjtu]

SELECT a.n, a.m, b.y, b.z
FROM (
    SELECT m, n
    FROM table1
    WHERE col1 = 'value1'
) a
JOIN (
    SELECT x, y, z
    FROM table2
    WHERE col1 = 'value1'
) b
ON a.m = b.x
;