Fatal error: require_once() [function.require]: Failed opening required '/forum/forums/libs/functions_forums.inc.php' (include_path='.:/usr/local/php5/lib/php') in /home/content/j/o/h/johncardillo/html/forum/forums/scripts/cfrm.inc.php on line 50

how can i solve this error?

It meens that the file located at /forum/forums/libs/functions_forums.inc.php does not exist. If you believe it should exist and that the location is relative to the base of your website then you will need to a - adjust it to the base of something like the server root or b - specify a location relative to the folder the script is in without a slash at the beginning.

there was problem in configuration file, i fixed it and now forum is working please see www.2aforum.com