moregroupware not working because of PHP

[Justin L. Boss]

When I log on to my web server where running moregroupware 
( www.webserver.com/webmail/setup/index.php ) I get :
"Fatal error: Call to undefined function: session_id() 
in /usr/local/www/moregroupware/include/log.inc.php on line 70"

I think it has something to do with the /usr/local/etc/php.conf or php.ini
I know this is not a moregroupware problem because I get the same error with 
squirrelmail. 

Thanks for your help in advance.
       
Justin
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