again about session handler

Hi!
I'm a newbie about linux, so having installed phpMyLibrary on kanotix linux, I'm now in trouble because I can'start the program.
I have Php5.1-1, Mysql-5.0.18-1 and Apache2.0.55-3.
I get this error message when I try to connect to the login page:
"Warning: session_set_save_handler() [function.session-set-save-handler]: Argument 2 is not a valid callback in /var/www/PhpMyLibrary/polerio/lib/Session.php on line 127

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /var/www/PhpMyLibrary/polerio/lib/Session.php:127) in /var/www/PhpMyLibrary/polerio/lib/Session.php on line 211

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /var/www/PhpMyLibrary/polerio/lib/Session.php:127) in /var/www/PhpMyLibrary/polerio/lib/Session.php on line 211

Warning: Cannot modify header information - headers already sent by (output started at /var/www/PhpMyLibrary/polerio/lib/Session.php:127) in /var/www/PhpMyLibrary/polerio/lib/Polerio.php on line 507"

My php.ini line 817 is:
session.save_handler = files
The polerio/lib/Session.php 127 line is:
"SessionGC");
Many thanks