session problem (i think)

I am running Apache/2.0.48 (Gentoo/Linux) mod_ssl/2.0.48 OpenSSL/0.9.6k PHP/4.3.4 I have a drupal site set up, http://rout.dyndns.org/cagc Since some time on Sunday i have had the following error appear at the bottom of the page: Warning: Unknown(): A session is active. You cannot change the session module's ini settings at this time. in Unknown on line 0 I then cannot login to the site. Some of the site functionality is there (ie you can view the basic pages etc, but anything that needs a login to acheive is no good) When I search google I seem to find that this is a php error, although I cannot see a fix anywhere. Can anyone tell me where to look in order to sort this out. I am a php newbie, so if there is any other info I need to provide please let me know. -- Nick Rout <nick@rout.co.nz>