Fatal error: Uncaught Error: Call to undefined function register_block_type() in /var/www/clients/client1/web8/web/service/wp-content/plugins/responsive-add-ons/src/blocks/block-newsletter/index.php:14 Stack trace: #0 /var/www/clients/client1/web8/web/service/wp-includes/class-wp-hook.php(286): responsive_blocks_register_newsletter_block('') #1 /var/www/clients/client1/web8/web/service/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #2 /var/www/clients/client1/web8/web/service/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /var/www/clients/client1/web8/web/service/wp-settings.php(458): do_action('init') #4 /var/www/clients/client1/web8/web/service/wp-config.php(102): require_once('/var/www/client...') #5 /var/www/clients/client1/web8/web/service/wp-load.php(37): require_once('/var/www/client...') #6 /var/www/clients/client1/web8/web/service/wp-blog-header.php(13): require_once('/var/www/client...') #7 /var/www/clients/client1/web8/web/service/index.php(30): require('/var/www/client...') in /var/www/clients/client1/web8/web/service/wp-content/plugins/responsive-add-ons/src/blocks/block-newsletter/index.php on line 14