[Plugin: WP phpBB Bridge] It dowsn't work on my blog

After installing it, I configured the plugin and wathever link I click I get errors like this
Warning: require(/web/htdocs/www.mylblog.it/home/forum): failed to open stream: No such device in /web/htdocs/www.myblog.it/home/wp-content/plugins/wp-phpbb-bridge/wp_phpbb_bridge.php on line 262 Fatal error: require(): Failed opening required ‘/web/htdocs/www.myblog.it/home/forum/’ (include_path=’.:/php5.3/lib/php/’) in /web/htdocs/www.myblog.it/home/wp-content/plugins/wp-phpbb-bridge/wp_phpbb_bridge.php on line 262

http://ww.wp.xz.cn/extend/plugins/wp-phpbb-bridge/