Phpbb installation

Bonjour,
je n'ai pas encore installé phpbb que quand je me connecte à l'endroit ou je l'ai envoyé
j'ai ce message :
Votre base est en cours de restauration.......
C'est fini. Votre base est en place sur cet hébergement.
Warning: Cannot modify header information - headers already sent by (output started at /home.10/cimamont/www/forum2/phpBB2/config.php:2) in /home.10/cimamont/www/forum2/phpBB2/common.php on line 180

Warning: main(./../extension.inc): failed to open stream: No such file or directory in /home.10/cimamont/www/forum2/install.php on line 314

Warning: main(): Failed opening './../extension.inc' for inclusion (include_path='.usr/local/lib/php') in /home.10/cimamont/www/forum2/install.php on line 314

Warning: main(./../includes/constants.): failed to open stream: No such file or directory in /home.10/cimamont/www/forum2/install.php on line 322

Warning: main(): Failed opening './../includes/constants.' for inclusion (include_path='.usr/local/lib/php') in /home.10/cimamont/www/forum2/install.php on line 322

Warning: main(./../includes/functions.): failed to open stream: No such file or directory in /home.10/cimamont/www/forum2/install.php on line 323

Warning: main(): Failed opening './../includes/functions.' for inclusion (include_path='.usr/local/lib/php') in /home.10/cimamont/www/forum2/install.php on line 323

Warning: main(./../includes/sessions.): failed to open stream: No such file or directory in /home.10/cimamont/www/forum2/install.php on line 324

Warning: main(): Failed opening './../includes/sessions.' for inclusion (include_path='.usr/local/lib/php') in /home.10/cimamont/www/forum2/install.php on line 324