Fatal error: Uncaught Error: Call to undefined function register_block_type() in /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-content/plugins/ninja-forms/blocks/bootstrap.php:21 Stack trace: #0 /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-includes/class-wp-hook.php(286): Ninja_Forms::{closure}('') #1 /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(true, Array) #2 /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-settings.php(450): do_action('init') #4 /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-config.php(82): require_once('/homepages/23/d...') #5 /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-load.php(37): require_once('/homepages/23/d...') #6 /homepages/23/d75576 in /homepages/23/d755761621/htdocs/clickandbuilds/HandWerkKunstSchiffenberg/wp-content/plugins/ninja-forms/blocks/bootstrap.php on line 21