PHPBB message d'erreur lecture topic

Bonjour,

je possède un forum en phpbb.. et je sais que l'autre jour sans faire exprès j'ai supprimé le dossier "includes" donc j'en ai remis un "neuf" mais je pense que c'est à cause de ça que j'ai un problème
Quand j'essaye de lire un topic, voilà le message d'erreur que j'ai :

"Warning: main(./includes/bbcode.php) [function.main]: failed to open stream: No such file or directory in /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php on line 27

Warning: main() [function.include]: Failed opening './includes/bbcode.php' for inclusion (include_path='/mnt/132/sdb/0/d/elodie.legale2/include:.:/usr/php4/lib/php') in /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php on line 27

Warning: Cannot modify header information - headers already sent by (output started at /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php:27) in /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php on line 562

Warning: Cannot modify header information - headers already sent by (output started at /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php:27) in /mnt/132/sdb/0/d/elodie.legale2/forum/includes/page_header.php on line 483

Warning: Cannot modify header information - headers already sent by (output started at /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php:27) in /mnt/132/sdb/0/d/elodie.legale2/forum/includes/page_header.php on line 485

Warning: Cannot modify header information - headers already sent by (output started at /mnt/132/sdb/0/d/elodie.legale2/forum/viewtopic.php:27) in /mnt/132/sdb/0/d/elodie.legale2/forum/includes/page_header.php on line 486"

J'aimerais savoir si quelqu'un a une solution ..... Merci d'avance !