[Rails] 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

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