Frustration: rails server not responding

I deleted to app folders, Hello and Blog, which I had created per
instructions of Beginning Rails 3. Thought I would start over again.
Now when I start the command line window on my Ruby192 folder and type
in "rails server", I only get the list of options for the command. I
can get the version, but not the server.

Do I need to reinstall rails?

Bruce

Ok, I see. Create a new app and start the server from there after you
install the bundle.

Think about it, if there is no app, what app will the server serve? the rails server command is run from inside the app root folder and passes the app to the server for serving.