Unload the session library

[eluser]aroman[/eluser]
Hi good morning guys,
this is the error ive encountered that made me a headache..

Code:

<p>Severity: Warning</p>
<p>Message:  Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\auction_dev_beta1\system\application\controllers\feed.php:1)</p>
<p>Filename: libraries/Session.php</p>
<p>Line Number: 315</p>

i got this error above when i autoload the session lib inside autoload.php..
but when i don't autoload the session lib but manually load for each controllers(i have 10 controllers), it works fine.

My question is, is it possible to unload the session lib for that particular controller like contact_us controller ?

Any ideas ?
Thanks and have a nice day..
-aroman