page php dans la page http

bonjour je viens d'installer un serveur Lamp mais le résultat de mes pages affiches le code php et n est pas interpréré pouvez vous m'aider?

je viens d'avancer un oeu et maintenant j'ai une erreur 500 sur tout le site ?

J'ai ouvlier les logs;

[Fri Oct 10 20:32:34.017060 2025] [php:warn] [pid 612:tid 612] [client 127.0.0.1:58570] PHP Warning:  require_once(/srv/web/gestionnel/config/site.php): Failed to open stream: No such file or directory in /srv/web/gestionnelc/config/config.php on line 2, referer: http://localhost/gestionnelc/public/
[Fri Oct 10 20:32:34.017139 2025] [php:error] [pid 612:tid 612] [client 127.0.0.1:58570] PHP Fatal error:  Uncaught Error: Failed opening required '/srv/web/gestionnel/config/site.php' (include_path='.:') in /srv/web/gestionnelc/config/config.php:2\nStack trace:\n#0 /srv/web/gestionnelc/public/auth-signin-basic.php(5): require_once()\n#1 {main}\n  thrown in /srv/web/gestionnelc/config/config.php on line 2, referer: http://localhost/gestionnelc/public/
[Fri Oct 10 20:32:34.028213 2025] [php:warn] [pid 611:tid 611] [client 127.0.0.1:58582] PHP Warning:  require_once(/srv/web/gestionnel/config/site.php): Failed to open stream: No such file or directory in /srv/web/gestionnelc/config/config.php on line 2, referer: http://localhost/gestionnelc/public/
[Fri Oct 10 20:32:34.028294 2025] [php:error] [pid 611:tid 611] [client 127.0.0.1:58582] PHP Fatal error:  Uncaught Error: Failed opening required '/srv/web/gestionnel/config/site.php' (include_path='.:') in /srv/web/gestionnelc/config/config.php:2\nStack trace:\n#0 /srv/web/gestionnelc/public/auth-signin-basic.php(5): require_once()\n#1 {main}\n  thrown in /srv/web/gestionnelc/config/config.php on line 2, referer: http://localhost/gestionnelc/public/
[Fri Oct 10 20:32:34.077216 2025] [php:warn] [pid 609:tid 609] [client 127.0.0.1:58586] PHP Warning:  require_once(/srv/web/gestionnel/config/site.php): Failed to open stream: No such file or directory in /srv/web/gestionnelc/config/config.php on line 2, referer: http://localhost/gestionnelc/public/
[Fri Oct 10 20:32:34.077308 2025] [php:error] [pid 609:tid 609] [client 127.0.0.1:58586] PHP Fatal error:  Uncaught Error: Failed opening required '/srv/web/gestionnel/config/site.php' (include_path='.:') in /srv/web/gestionnelc/config/config.php:2\nStack trace:\n#0 /srv/web/gestionnelc/public/auth-signin-basic.php(5): require_once()\n#1 {main}\n  thrown in /srv/web/gestionnelc/config/config.php on line 2, referer: http://localhost/gestionnelc/public/