what is error no 1064 in codeigniter?

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PHP

MySQL

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 ')' at line 1

SELECT DISTINCT(`menucat`) FROM permissions WHERE perm_id in()

Filename: /home/sbgroup/public_html/saibhavana/models/index_model.php

Line Number: 44