why would they want to be a GM if they can just open their own server and be the owner o.o?
try your best to read the .bat errors or post a screenshot of them. they should be really straightforward. or you can even google the errors since I'm almost positive that someone else has had the issue before.
some things to check:
- make sure you have java files placed in the right locations
- you changed the server's ip to your own (localhost/vps/whatever)
- you have your database up
here's a link to the FAQ. you should always check it before making a new thread.