Fatal error: Uncaught Error: Class "WP_Widget" not found in /var/www/eintrachtpodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/lib/modules/subscribe_button/widget.php:7 Stack trace: #0 {main} thrown in /var/www/eintrachtpodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/lib/modules/subscribe_button/widget.php on line 7