[Rails] Re: 0.0.0.0:3000--> this web page isnot availabe

hi all,
I'm very new to ruby on rails. and i have a problem while trying to run
my first application.
i'm created a rails application and controller called say conains action
called hello and put some html code in
app--view--say--say.rhtml

and when i run 0.0.0.0:3000/say/hello i get this message "this webpage
isn't available"

and also tried to remove " index.html" from the application and remove
say.rhtml and put instead of it "hello.html.erb".
and i'm still ave the same problem
so how can i fix this problem?

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