I am running SuSE Linux 9.0 Open Enterprise Server with Novell OES and also received the message:
Cannot adjust 'apache2' service.
Thanks to you I've been able to rectify the problem.
It was a syntax error in my httpd.conf file. I never edited mine either but mine wasn't missing the </Directory> tag, it started with <Directory/>, so I removed the slash and BINGO.