Fatal error: Uncaught ArgumentCountError: Too few arguments to function WP_Widget::__construct(), 0 passed in /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-widget-factory.php on line 61 and at least 2 expected in /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-widget.php:162
Stack trace:
#0 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-widget-factory.php(61): WP_Widget->__construct()
#1 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/widgets.php(115): WP_Widget_Factory->register()
#2 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-content/themes/ferienwohnung/functions.php(388): register_widget()
#3 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-hook.php(292): twentyeleven_widgets_init()
#4 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()
#5 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/plugin.php(484): WP_Hook->do_action()
#6 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/widgets.php(1799): do_action()
#7 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-hook.php(292): wp_widgets_init()
#8 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()
#9 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/plugin.php(484): WP_Hook->do_action()
#10 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-settings.php(560): do_action()
#11 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-config.php(88): require_once('...')
#12 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-load.php(37): require_once('...')
#13 /mnt/web012/d0/27/52869527/htdocs/ferien/wp-blog-header.php(13): require_once('...')
#14 /mnt/web012/d0/27/52869527/htdocs/ferien/index.php(17): require('...')
#15 {main}
  thrown in /mnt/web012/d0/27/52869527/htdocs/ferien/wp-includes/class-wp-widget.php on line 162