title: TypeError: can't convert Pathname to String
body: <p>I'm getting <code>TypeError: can't convert Pathname to String</code> after requiring r18n file in the app. </p>
  
  <p>myapp.rb</p>
  
  <pre><code>require 'sinatra/r18n' 
  </code></pre>
  
  <p>This is my Gemfile:</p>
  
  <pre><code>gem 'sinatra-r18n'
  </code></pre>
  
  <p>Any idea?</p>