title: How to fix this symfony permission error?
body: <p>On my live site I'm facing this problem when I load my browser:</p>
  
  <blockquote>
    <p>ContextErrorException in FileProfilerStorage.php line 158: Warning:
    file_put_contents(/var/www/html/var/cache/dev/profiler/c9/73/fb73c9):
    failed to open stream: Permission denied</p>
  </blockquote>
  
  <p>How can I fix this problem at the live site?</p>