CodingForums.com - We're Sorry error and other questions

OK I've started. finished the install, not sure what happened there, and started a tutorial. Of course, immediate error. I've made a lsit and cheked it twice to make sure I did all the steps correctly. In a dos command prompt I ran the application creation command and then created the controller MyTest.
In the controllers directory it created My_test_controller.rb. When I went to test it I got an error that says "We're sorry, but something went wrong. We have been notified about this issue and will look into it shortly." In jEdit I have the file open and it has

Code:

class MyTestController < ApplicationController

        def index

                render_text "Not another Hello world?!?"

        end

end

1. How do I know things are working as far as the interpreter and the code?
2. Is the "Something went wrong..." equivalent to a 404 eror?
3. Will I always have to start Ruby script/server in a DOS prompt?
4. Does the DOS window always have to remain open while playing with rails?

Windows XP
Firefox 3.5.3
Rails 2.3.4

Tutorial

Thanks for the patient replies.