Warning: require(./includes/session.php): Failed to open stream: No such file or directory in /volume1/web/sulle_dk/webtrees-sprenger/mediaviewer.php on line 31

Fatal error: Uncaught Error: Failed opening required './includes/session.php' (include_path='.:/usr/share/pear') in /volume1/web/sulle_dk/webtrees-sprenger/mediaviewer.php:31
Stack trace:
#0 {main}
  thrown in /volume1/web/sulle_dk/webtrees-sprenger/mediaviewer.php on line 31