error exclude files and directories

HELP What should I do to fix this….
I’m not able to select any files in the “exclude files and directories” This message appears in the box

Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/nfs:/tmp:/usr/local:/etc/apache2/gs-bin) in /nfs/c06/h05/mnt/153625/domains/neobin.ca/html/wp-content/plugins/wordpress-backup-to-dropbox/Views/wp-backup-to-dropbox-file-tree.php on line 35

http://wordpress.org/plugins/wordpress-backup-to-dropbox/