Clean install of rails

[VictorHRepo]

Hi, I got to this step in the process http://installfest.railsbridge.org/installfest/create_a_rails_app
but I'm running into problems, specifically when I try to run $ rails server I get this message back: Exiting
/Users/victorholmes/.rvm/gems/ruby-2.3.4/gems/puma-3.11.2/lib/puma/launcher.rb:342:in stat': No such file or directory @ rb_file_s_stat - /Users/victorholmes/test_app (Errno::ENOENT) from /Users/victorholmes/.rvm/gems/ruby-2.3.4/gems/puma-3.11.2/lib/puma/launcher.rb:342:in generate_restart_data'

I was wondering how I could do a clean install, and start over.