PHP Fatal error
 

hello support

i have this error and it's repeated every some minutes
Code:
[Sun Jun 13 04:05:07 2010] [error] [client 123.27.27.203] PHP Fatal error: Call to a member function query() on a non-object in /****/****/public_html/includes/cron/cleanup.php(81) : eval()'d code on line 3, referer: http://forums.cgway.net/
please help me