Warning: require_once(include/session.inc): Failed to open stream: No such file or directory in /customers/4/a/6/cgmn.nl/httpd.www/admin/index.php on line 10

Fatal error: Uncaught Error: Failed opening required 'include/session.inc' (include_path='.:/usr/share/php:/customers/cgmn.nl/cgmn.nl/httpd.www:D:\Mijn documenten\www\www_ck\cgmn.nl') in /customers/4/a/6/cgmn.nl/httpd.www/admin/index.php:10
Stack trace:
#0 /customers/4/a/6/cgmn.nl/httpd.www/index.php(8): include()
#1 {main}
  thrown in /customers/4/a/6/cgmn.nl/httpd.www/admin/index.php on line 10