Fatal error: Uncaught Error: Call to undefined function trailingslashit() in /customers/8/7/c/sund-forskning.dk/httpd.www/wp-includes/class-wp-textdomain-registry.php:103
Stack trace:
#0 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-includes/l10n.php(784): WP_Textdomain_Registry->set('default', 'en_GB', '/customers/8/7/...')
#1 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-includes/load.php(1401): load_textdomain('default', '/customers/8/7/...', 'en_GB')
#2 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-includes/load.php(278): wp_load_translations_early()
#3 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-settings.php(74): wp_maintenance()
#4 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-config.php(110): require_once('/customers/8/7/...')
#5 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-load.php(50): require_once('/customers/8/7/...')
#6 /customers/8/7/c/sund-forskning.dk/httpd.www/wp-blog-header.php(13): require_once('/customers/8/7/...')
#7 /customers/8/7/c/sund-forskning.dk/httpd.www/index.php(17): require('/customers/8/7/...')
#8 {main}
  thrown in /customers/8/7/c/sund-forskning.dk/httpd.www/wp-includes/class-wp-textdomain-registry.php on line 103