title: 500 internal server error after cache clear in prestashop
body: <p>After turning off cache and clearing it on my prestashop store im gettin 500 internal server error. When im turning on error reporting, im getting error like this:</p>
  
  <pre><code>Fatal error: require_once(): Failed opening required '/var/cache/prod/appParameters.php' (include_path='/vendor/pear/pear_exception:/vendor/pear/console_getopt:/vendor/pear/pear-core-minimal/src:/vendor/pear/archive_tar:.:/:/usr/local/php56/lib/pear') in /config/bootstrap.php on line 86
  </code></pre>
  
  <p>But when i turn on debug mode, store is loading copletely.</p>
  
  <p>Where could be a problem?</p>