Forum Error loading forum.php

[محروم.كوم]

Hello

Today i got that error msg on mine forum

Code:
Database error in vBulletin 4.2.0:

Invalid SQL:


REPLACE INTO datastore
(title, data, unserialize)
VALUES
('birthdaycache', 'a{s\"day1\";s\"2013-01-01\";s\"day2\";s\"2013-01-02\";s\"users1\";a:18807:{i:0;a{s\"userid \";s\"4\";s\"username\";s\



MySQL Error : Got a packet bigger than 'max_allowed_packet' bytes
Error Number : 1153
Request Date : Tuesday, January 1st 2013 @ 02:41:58 PM
Error Date : Tuesday, January 1st 2013 @ 02:41:58 PM
Script : http://www.pequenasnotaveis.com.br/forum.php
Referrer :
IP Address : 177.2.182.175
Username : silverfox
Classname : vB_Database
MySQL Version : 5.1.63-cll
i tried to edit max_allowed_packet on my.cnf whitout success and now i can't see that error msg...

many other areas from forum are working, like admincp/ blogs.php userprofile __DEFINE_LIKE_SHARE__