title: The service "uri_signer" has a dependency on a non-existent parameter "kernel.secret". Did you mean this: "kernel.charset"?
body: <p>When I clear my cache with <code>app/console cache:clear</code> I get the error:</p>
  
  <pre><code>[Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException]
    The service "uri_signer" has a dependency on a non-existent parameter "kernel.secret". Did you mean this: "kernel.charset"?
  </code></pre>
  
  <p>What does it mean?</p>