Ошибка базы данных.

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'index,author)) >0 ORDER BY `date` desc' at line 3

SELECT * FROM `ra_materials` WHERE (FIND_IN_SET(index,author)) >0 ORDER BY `date` desc

Filename: modules/authors/models/Authors.php

Line Number: 91