Fatal error: Cannot redeclare sanitize_url() (previously declared in /wp-includes/formatting.php:4592) in /wp-includes/deprecated.php on line 2037

Fatal error: Uncaught Error: Call to a member function set() on null in /wp-includes/l10n.php:856 Stack trace: #0 /wp-includes/l10n.php(959): load_textdomain('default', '//wp-content/la...', 'hu_HU') #1 /wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /wp-includes/l10n.php on line 856