gistfile1.rb

# The following sample code doesn't work for me - any ideas on what I need to change? 
# (you need a hoptoad API key to run this..
require 'rubygems'
require 'sinatra/base'
require 'rack/hoptoad'
API_KEY = 'YOUR HOPTOAD API HERE'

class MyApp < Sinatra::Base  # (was Sinatra::Default)
  use Rack::Hoptoad, API_KEY
  enable :raise_errors
  set :show_exceptions, false

  get "/" do
    "Try raising an exception: <a href='/boom'>Boom</a>"
  end
  get "/boom" do
    raise "Sinatra has left the building"
  end
end

MyApp.run!