yum error could not load sqlite, falling back to pickle

Hi Experts,

I have a Redhat EL 4 server installed with yum for my updates the updates work fine. Everyday I get the error below being sent by cron to my mail box and it's so irritating to me and the team. Please can some one assist in resolving this problem as I have no idea what is causing it. I know redhat EL4 comes with up2date instaed of yum but we installed yum on it. Please also check below the yum version installed.

/etc/cron.daily/yum.cron:

Warning, could not load sqlite, falling back to pickle Warning, could not load sqlite, falling back to pickle

YUM details:

[gugu@cad ~]$ sudo su -
Password:
[root@cad ~]# rpm -qi yum
Name        : yum                          Relocations: (not relocatable)
Version     : 2.6.1                             Vendor: (none)
Release     : 1                             Build Date: Thu 07 Feb 2008 04:17:38 PM SAST
Install Date: Wed 07 May 2008 03:05:43 PM SAST      Build Host: nzduat.co.za
Group       : System Environment/Base       Source RPM: yum-2.6.1-1.src.rpm
Size        : 1420689                          License: GPL
Signature   : (none)
URL         : http://linux.duke.edu/yum/
Summary     : RPM installer/updater
Description :
Yum is a utility that can check for and automatically download and
install updated RPM packages. Dependencies are obtained and downloaded
automatically prompting the user as necessary.
[root@cad ~]#