wp-config problems

Could somebody please help me with the following problem.
I’m trying to install a wordpress blog on our site. http://www.dansspetters.nl/yabb
but we can’t seem to get the php-config right.
This is the errormessage:

Warning: main() [function.main]: open_basedir restriction in effect. File(../wp-includes/compat.php) is not within the allowed path(s): (.:/tmp) in /ext/d/da/dansspetters.nl/html/yabb/wp-admin/install.php on line 4

Warning: main(../wp-includes/compat.php) [function.main]: failed to open stream: Operation not permitted in /ext/d/da/dansspetters.nl/html/yabb/wp-admin/install.php on line 4

Fatal error: main() [function.require]: Failed opening required ‘../wp-includes/compat.php’ (include_path=’.:/usr/share/php:/usr/share/pear’) in /ext/d/da/dansspetters.nl/html/yabb/wp-admin/install.php on line 4

Thank you for your time