Unknown column '20DESC' in 'order clause'
Array
(
    [0] => Error Number: 1054
    [1] => Unknown column '20DESC' in 'order clause'
    [2] => SELECT SQL_CALC_FOUND_ROWS * FROM RETS_Property WHERE feed IN("RANWW-TRESTLE")  AND  (`status` LIKE "Active%")  AND  deleted<=0 ORDER BY LENGTH(mlsNum), mlsNum%20DESC LIMIT 9, 9
)