Fatal error: Uncaught Error: Call to undefined function get_locale() in /usr/home/ult/domains/ultswiecie.edu.pl/public_html/wp-admin/includes/admin.php:16
Stack trace:
#0 /usr/home/ult/domains/ultswiecie.edu.pl/public_html/xmlrpc.php(62): require_once()
#1 {main}
  thrown in /usr/home/ult/domains/ultswiecie.edu.pl/public_html/wp-admin/includes/admin.php on line 16