[Rails] localhost:3000

Alright, so I've been starting to use rails lately. The thing is while
getting set up I had an issue. The issue was localhost:3000 not showing
up.
I fixed it BUT when I changed the root of my application, it doesn't
show it. In fact, it returns a routing error. The error says this:

---------------------------------------------------------------------------

Routing Error

No route matches [GET] "/"

Try running rake routes for more information on available routes.

---------------------------------------------------------------------------

Help?

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