Fatal error: Uncaught Error: Call to undefined function register_block_type() in /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-content/plugins/ninja-forms/blocks/bootstrap.php:21 Stack trace: #0 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-includes/class-wp-hook.php(286): Ninja_Forms::{closure}('') #1 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(true, Array) #2 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-settings.php(450): do_action('init') #4 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-config.php(86): require_once('/home/klient.dh...') #5 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-load.php(37): require_once('/home/klient.dh...') #6 /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-blog-header.php(13): require_once('/home/klient.dh...') in /home/klient.dhosting.pl/imperial/24cv.pl-oon3/public_html/wp-content/plugins/ninja-forms/blocks/bootstrap.php on line 21