title: Creating new models not possible
body: <p>I would like to create a new model for a Ruby on Rails application. I know that this should do:</p>
  
  <pre><code>$ ruby script/generate model Book
  </code></pre>
  
  <p>But it gives me:</p>
  
  <pre><code>ruby: No such file or directory -- script/generate (LoadError)
  </code></pre>
  
  <p>Why is that? How can I fix that? I am in my application folder.</p>