Erreur au redemarrage du httpd

Bonjour, quand je redemarre le service httpd , et je regarde le fichier error.log de mon apache , j'ai les erreurs suivantes :

Code:

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[Wed Mar 27 15:30:43 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Wed Mar 27 15:30:43 2013] [notice] Digest: generating secret for digest authentication ...
[Wed Mar 27 15:30:43 2013] [notice] Digest: done
PHP Warning:  Module 'ldap' already loaded in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules//usr/lib64/php/modules/mysql.so' -$
[Wed Mar 27 15:30:43 2013] [notice] Apache/2.2.3 (CentOS) configured -- resuming normal operations
[Wed Mar 27 15:31:58 2013] [error] [client @ File does not exist: /var/www/html/system.xml
[Wed Mar 27 15:31:58 2013] [error] [client @] File does not exist: /var/www/html/u_indexmain.htm
[Wed Mar 27 15:31:58 2013] [error] [client @] File does not exist: /var/www/html/systemunit.xml
[Wed Mar 27 15:31:59 2013] [error] [client @] File does not exist: /var/www/html/tcs
[Wed Mar 27 15:31:59 2013] [error] [client @] File does not exist: /var/www/html/system.xml
[Wed Mar 27 15:32:01 2013] [error] [client @] File does not exist: /var/www/html/system.xml
[Wed Mar 27 15:32:01 2013] [error] [client @] File does not exist: /var/www/html/u_indexmain.htm

et ces erreus quand je vais sur http://adresse/nagios/

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[Wed Mar 27 15:42:05 2013] [error] [client @] PHP Warning:  MagpieRSS: Failed to fetch http://www.nagios.org/backend/feeds/corepromo and cache is$
[Wed Mar 27 15:42:05 2013] [error] [client @] PHP Warning:  MagpieRSS: Failed to fetch http://www.nagios.org/backend/feeds/frontpage/ and cache i$

et quand j'essaye d'aller à http://adresse/centreon/ j'ai " page non trouvé "

et cette erreur qui est ecrire sur mon fichier log apache :

Code:

File does not exist: /var/www/html/centreon

Pouvez vous m'aider à résoudre mon prob s'il vous plait?