Admin page not open

Hello,

I install wordpress mu to my site, After installation I got a message” Warning: require_once() [function.require-once]: open_basedir restriction in effect. File(../wp-load.php) is not within the allowed path(s): (/firewall:/tmp:.) in ../wp-admin/admin.php on line 20

Warning: require_once(../wp-load.php) [function.require-once]: failed to open stream: Operation not permitted in ../wp-admin/admin.php on line 20

Fatal error: require_once() [function.require]: Failed opening required ‘../wp-load.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php:/firewall’) in …/wp-admin/admin.php on line 20″ wen I trying to login in to admin page .

Please Help me..