Reglér probleme d'inscription et d'upload

voila bonjour hier j'ai acheter un script upload le site s'affiche bien ma 3 erreur sont marquer

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /var/www/clients/client2/web24/web/config.php:1) in /var/www/clients/client2/web24/web/page.php on line 4

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /var/www/clients/client2/web24/web/config.php:1) in /var/www/clients/client2/web24/web/page.php on line 4

Fatal error: Call to undefined function sqlite_open() in /var/www/clients/client2/web24/web/page.php on line 98

vous pouvez me les regler merci