cPanel + Ruby on Rails: Cannot get apps to Run

I'm having some problems with cpanel + Ruby on Rails on CentOS4.3-32.

Whenever I set up a RoR app through cpanel , and then click "Run", it gives me the message:
Start Ruby Application

The following Ruby on Rails application was started: "app name"


However, when I go back to the overview page, it says the app status is "not running". The URL (domainname:12001) is not working either.

When I log into the server, all logs seem to be empty , I can get the app to start (on port 3000) through "mongrel_rails start -d" , however, I'd prefer to start it through cpanel.

Thanks in advance!