Fatal error: Uncaught ArgumentCountError: Too few arguments to function WP_Widget::__construct(), 0 passed in /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-widget-factory.php on line 61 and at least 2 expected in /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-widget.php:162
Stack trace:
#0 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-widget-factory.php(61): WP_Widget->__construct()
#1 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/widgets.php(115): WP_Widget_Factory->register('AJAX_Calendar_W...')
#2 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-content/plugins/ajax-calendar/ajax-calendar.php(141): register_widget('AJAX_Calendar_W...')
#3 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-hook.php(287): register_ajax_calendar_widget('')
#4 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters('', Array)
#5 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#6 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/widgets.php(1795): do_action('widgets_init')
#7 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-hook.php(287): wp_widgets_init('')
#8 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#9 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#10 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-settings.php(557): do_action('init')
#11 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-config.php(159): require_once('/customers/8/0/...')
#12 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-load.php(37): require_once('/customers/8/0/...')
#13 /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-blog-header.php(13): require_once('/customers/8/0/...')
#14 /customers/8/0/e/meiapopeia.de/httpd.www/index.php(17): require('/customers/8/0/...')
#15 {main}
  thrown in /customers/8/0/e/meiapopeia.de/httpd.www/wp/wp-includes/class-wp-widget.php on line 162