UBB.threads PHP Forum Software Community Forums UBB.threads 7 Installation and Upgrade Support Undefined function session_cache_expire

Hi!
My server: FreeBSD 6.2, Apache 2.2.4, MySQL 4.1.22, PHP 4.4.6.
I got this error on table creation step (createtable.php) script:
Fatal error: Call to undefined function: session_cache_expire() in /home/user/www/forum/libs/ubbthreads.inc.php on line 44
Where may be a problem?

Thank you!