title: Error 'SECURITY WARNING: No secret option provided to Rack::Session::Cookie'
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/10374871/no-secret-option-provided-to-racksessioncookie-warning">No secret option provided to Rack::Session::Cookie warning?</a>  </p>
  </blockquote>
  
  
  
  <p>While creating scaffolding, I got this error today:</p>
  
  <blockquote>
    <p>SECURITY WARNING: No secret option provided to Rack::Session::Cookie. This poses a security threat. It is strongly recommended that you provide a secret to prevent exploits that may be possible from crafted cookies. This will not be supported in future versions of Rack, and future versions will even invalidate your existing user cookies.</p>
  </blockquote>
  
  <p>But the key is set in <code>config/initializers/secret_token.rb</code>.</p>
  
  <p>Am I supposed to do anything or is this just a standard warning which I can safely ignore since I already have the key?</p>