Fatal error: Uncaught Error: Call to undefined function __() in /var/www/html/wp-admin/includes/file.php:16 Stack trace: #0 /var/www/html/wp-config.php(13): require_once() #1 /var/www/html/wp-load.php(50): require_once('...') #2 /var/www/html/wp-blog-header.php(13): require_once('...') #3 /var/www/html/index.php(17): require('...') #4 {main} thrown in /var/www/html/wp-admin/includes/file.php on line 16