Fatal error: Uncaught Error: Call to undefined function register_block_type() in /wp-content/plugins/ninja-forms/blocks/bootstrap.php:21 Stack trace: #0 /wp-includes/class-wp-hook.php(286): Ninja_Forms::{closure}('') #1 /wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(true, Array) #2 /wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /wp-settings.php(450): do_action('init') #4 /wp-config.php(97): require_once('/wp-settings.ph...') #5 /wp-load.php(37): require_once('/wp-config.php') #6 /wp-blog-header.php(13): require_once('/wp-load.php') #7 /index.php(17): require('/wp-blog-header...') #8 {main} thrown in /wp-content/plugins/ninja-forms/blocks/bootstrap.php on line 21