Problema nell'installazione per phpBB forum.

Ciao ragazzi!

Io c'ho un problema. Già da qualche giorno sto cercando di installare un forum phpBB ma non riesco ad aprirlo. Fino a ieri mi diceva questo:

Your website is up and running!

Website has been successfully installed on server.
Please delete file "default.php" from public_html folder and upload your website by using FTP or web based File Manager.

- Your account information can be found on 000webhost.com Members Area
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Below you can see your current files in public_html folder.

Poi oggi ho cancellato il file "default.php" e ora mi dice Index of /

- adm/
- docs/
- download/

adm/

PHP Error Message

Warning: require(./../common.php) [function.require]: failed to open stream: No such file or directory in /home/a5950548/public_html/adm/index.php on line 20

PHP Error Message

Fatal error: require() [function.require]: Failed opening required './../common.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/a5950548/public_html/adm/index.php on line 20

docs/

Index of /docs

Parent Directory
AUTHORS
CHANGELOG.html
COPYING
FAQ.html
INSTALL.html
README.html
auth_api.html
bg_header.gif
coding-guidelines.html
corners_left.gif
corners_left.png
corners_right.gif
corners_right.png
hook_system.html
lighttpd.sample.conf
nginx.sample.conf
site_logo.gif
stylesheet.css

Che cosa devo fare? Qual'è il problema?

Grazie in anticipo per l'aiuto.

Ragazzi, aiuto, datemi una mano a installare il forum e a farmi capire dove sbaglio perfavore. Coraggio.

Grazie.