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/plugin.php(524): Ninja_Forms::{closure}('') #1 /wp-settings.php(411): do_action('init') #2 /wp-config.php(77): require_once('/wp-settings.ph...') #3 /wp-load.php(39): require_once('/wp-config.php') #4 /wp-blog-header.php(13): require_once('/wp-load.php') #5 /index.php(17): require('/wp-blog-header...') #6 {main} thrown in /wp-content/plugins/ninja-forms/blocks/bootstrap.php on line 21