Hi What does this mean?
files appear to be missing or out of place. Please re-install plugin or remove /customers/0/7/d/martinfalck.se/httpd.www/wp-content/advanced-cache.php.
Warning: Cannot modify header information - headers already sent by (output started at /customers/0/7/d/martinfalck.se/httpd.www/wp-content/advanced-cache.php:26) in /customers/0/7/d/martinfalck.se/httpd.www/wp-admin/includes/misc.php on line 1196