Problems with Rack and Sinatra

I'm trying to use rack to deploy a sinatra application.
So far I have this in my in the webapp root
require 'rubygems'
require 'sinatra'

  :run => false,
  :env => :production,
  :views => '/webapps/example'

require 'app.rb'
run Sinatra.application

Now in the sinatra app, it's simple. I just have this:
get '/' do
  'Hello Sinatra!'

When I try to access the website I get this error:
undefined method `default_options' for Sinatra::Application:Class

I'm pretty new to Ruby so any pointers on where to look would be

Thanks in advance.


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