How to resolve HTTP 500 error recieved while testing the jetty based server launch for debugging?

I am getting HTTP 500 error when I hit the URL ( https://localhost:7443/jazz/admin ) through the web browser as part of testing the jetty based server launch for debugging.
I have religiously followed all the steps mentioned in the attached document ( Section : 1.6 TEST THE JETTY BASED SERVER LAUNCH ) but still I am getting this error. Please help me out in resolving that.