Function.php second line problem

http://www.pagebowl.com/tos.php

I checked my functions line two and i have session_start();
whats wrong with it?

I get the error

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/pagebowl/public_html/tos.php:1) in /home/pagebowl/public_html/functions.php on line 2