Error

Error message

ArgumentCountError: Too few arguments to function drupal_add_http_header(), 1 passed in /var/www/vhosts/optikaxtena.gr/alternatrips.gr/sites/all/themes/valenti/templates/views-view-views-rss--rss.tpl.php on line 2 and at least 2 expected in drupal_add_http_header() (line 1144 of /var/www/vhosts/optikaxtena.gr/alternatrips.gr/includes/bootstrap.inc).
The website encountered an unexpected error. Please try again later.