Fatal error: Uncaught Error: Class "WP_Upgrader" not found in /home/klient.dhosting.pl/dlugoszartu/testy.admanagement.pl/public_html/skrypty/php-createwp/wordpress 6.7/wp-admin/includes/class-language-pack-upgrader.php:19 Stack trace: #0 {main} thrown in /home/klient.dhosting.pl/dlugoszartu/testy.admanagement.pl/public_html/skrypty/php-createwp/wordpress 6.7/wp-admin/includes/class-language-pack-upgrader.php on line 19