Fatal error: Uncaught Error: Call to undefined function trailingslashit() in /mnt/web624/d2/83/524220583/htdocs/wp-includes/class-wp-textdomain-registry.php:103
Stack trace:
#0 /mnt/web624/d2/83/524220583/htdocs/wp-includes/l10n.php(784): WP_Textdomain_Registry->set('default', 'es_ES', '/mnt/web624/d2/...')
#1 /mnt/web624/d2/83/524220583/htdocs/wp-includes/load.php(1401): load_textdomain('default', '/mnt/web624/d2/...', 'es_ES')
#2 /mnt/web624/d2/83/524220583/htdocs/wp-includes/load.php(278): wp_load_translations_early()
#3 /mnt/web624/d2/83/524220583/htdocs/wp-settings.php(74): wp_maintenance()
#4 /mnt/web624/d2/83/524220583/htdocs/wp-config.php(86): require_once('/mnt/web624/d2/...')
#5 /mnt/web624/d2/83/524220583/htdocs/wp-load.php(50): require_once('/mnt/web624/d2/...')
#6 /mnt/web624/d2/83/524220583/htdocs/wp-blog-header.php(13): require_once('/mnt/web624/d2/...')
#7 /mnt/web624/d2/83/524220583/htdocs/index.php(17): require('/mnt/web624/d2/...')
#8 {main}
  thrown in /mnt/web624/d2/83/524220583/htdocs/wp-includes/class-wp-textdomain-registry.php on line 103