Error: Could not find or load main class org.jitsi.jicofo.Main

Hi. I’ve follow the third first step of how to run Jicofo from distribution package on my Mac OS as mentioned here: https://github.com/jitsi/jicofo/blob/master/README.md
When I’m running the fourth step ./jicofo.sh --domain=jitsi.exmaple.com --secret=focus_secret --user_domain=auth.jitsi.example.com --user_name=focus --user_password=focuspassword, I got the following error in command line Error: Could not find or load main class org.jitsi.jicofo.Main.

How do I solve this problem?

Regards
Gerard