Fatal error: Uncaught Error: Call to undefined method WP_Block_Type_Registry::get_instance() in /var/www/html/hosting/sasfly.net/wp-includes/class-wp-theme-json.php:1149 Stack trace: #0 /var/www/html/hosting/sasfly.net/wp-includes/class-wp-theme-json.php(762): WP_Theme_JSON::get_blocks_metadata() #1 /var/www/html/hosting/sasfly.net/wp-includes/class-wp-theme-json-data.php(44): WP_Theme_JSON->__construct(Array, 'default') #2 /var/www/html/hosting/sasfly.net/wp-includes/class-wp-theme-json-resolver.php(175): WP_Theme_JSON_Data->__construct(Array, 'default') #3 /var/www/html/hosting/sasfly.net/wp-content/plugins/mailpoet/vendor/mailpoet/email-editor/src/Engine/class-theme-controller.php(15): WP_Theme_JSON_Resolver::get_core_data() #4 /var/www/html/hosting/sasfly.net/wp-content/plugins/mailpoet/generated/FreeCachedContainer.php(3457): MailPoet\EmailEditor\Engine\Theme_Controller->__construct() #5 /var/www/html/hosting/sasfly.net/wp-content/plugins/mailpoet/generated/FreeCachedContainer.php(3417): MailPoetGenerated\FreeCachedC in /var/www/html/hosting/sasfly.net/wp-includes/class-wp-theme-json.php on line 1149