Invalid command 'php_admin_value'

Problem:
(ubuntu 8.04.2 just installed before ehcp)
after running ./install.sh,
ehcp installation seems successful, but typing http://*.*.*.*/vhosts/ehcp in URL will bring "page load error" page.
Then i try /etc/init.d/ehcp restart
stopping ehcp..
stopping ehcpdaemon2.sh
stopping index.php daemon
stopping ehcp_daemon.py, python background server process
starting ehcp..
starting ehcp_daemon.py
root 13630 0.0 0.4 3764 1200 pts/1 S+ 16:51 0:00 /bin/bash /var/www/vhosts/ehcp/ehcpdaemon2.sh
root 13631 0.0 2.0 28868 5352 pts/1 R+ 16:51 0:00 php index.php daemon
root 13628 6.0 1.7 7044 4372 pts/1 R+ 16:51 0:00 python /etc/init.d/ehcp_daemon.py
ehcp seems ok.

then i try to reload apache, i got error like following:
Syntax error on line 19 of /var/www/vhosts/ehcp/apachehcp.conf:
Invalid command 'php_admin_value', perhaps misspelled or defined by a module not included in the server configuration ...fail!

can someone give me some help?
Thank you

That is caused by somehow, missing of apache-php installation,
to fix,
do:

aptitude install libapache2-mod-php5
cd /etc/apache2/mods-enabled/
ln -s ../mods-available/php5.conf ./php5.conf
ln -s ../mods-available/php5.load ./php5.load
/etc/init.d/apache2 restart

Thank you ehcpdeveloper