Fatal error: Uncaught Error: Call to undefined function register_block_type() in /homepages/34/d151568689/htdocs/timprobst/blog/wp-content/plugins/responsive-add-ons/src/blocks/block-newsletter/index.php:14 Stack trace: #0 /homepages/34/d151568689/htdocs/timprobst/blog/wp-includes/class-wp-hook.php(286): responsive_blocks_register_newsletter_block('') #1 /homepages/34/d151568689/htdocs/timprobst/blog/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #2 /homepages/34/d151568689/htdocs/timprobst/blog/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /homepages/34/d151568689/htdocs/timprobst/blog/wp-settings.php(450): do_action('init') #4 /homepages/34/d151568689/htdocs/timprobst/blog/wp-config.php(90): require_once('/homepages/34/d...') #5 /homepages/34/d151568689/htdocs/timprobst/blog/wp-load.php(37): require_once('/homepages/34/d...') #6 /homepages/34/d151568689/htdocs/timprobst/blog/wp-blog-header.php(13): require_once('/homepages/34/d...') #7 /homepages/34/d151568689/htdocs/timprobst/index. in /homepages/34/d151568689/htdocs/timprobst/blog/wp-content/plugins/responsive-add-ons/src/blocks/block-newsletter/index.php on line 14