title: Cannot load files using require
body: <p>I just downloaded Ruby 2.0 and have a serious problem with <code>require</code> when I try to run a simple Sinatra app:</p>
  
  <pre><code>/Users/Kuba/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- sinatra (LoadError)
  from /Users/Kuba/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
  from test.rb:1:in `&lt;main&gt;'
  </code></pre>
  
  <p>Also, this and other programs I have a problem with now, worked perfectly fine when i was using Ruby 1.8.7.</p>
  
  <p>What should I do?</p>