[eluser]InsiteFX[/eluser]
That is not a CI error! That is the way the web works!
To fix it you need to use a .htaccess file. Get rid of www
Code:
RewriteCond %{http_host} ^www\.your_domain\.com [NC]
RewriteRule ^(.*)$ http://your_domain.com/$1 [R=301,NC]
InsiteFX