Fatal error: Uncaught Error: Call to a member function register() on null in /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-includes/widgets.php:113 Stack trace: #0 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-content/plugins/revslider/includes/framework/functions-wordpress.class.php(258): register_widget(''.RevSliderWidg...') #1 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-content/plugins/revslider/includes/framework/functions-wordpress.class.php(260): RevSliderFunctionsWP::{closure}('RevSliderWidget') #2 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-content/plugins/revslider/revslider.php(85): RevSliderFunctionsWP::registerWidget('RevSliderWidget') #3 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-settings.php(254): include_once('/customers/0/3/...') #4 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-config.php(89): require_once('/customers/0/3/...') #5 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-load.php(37): require_once('/customers/0/3/...') #6 /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-blog-header.php(12): require_once('/customers/0/3/...') #7 /customers/0/3/2/reineckeimmobilien.de/httpd.www/index.php(17): require('/customers/0/3/...') #8 {main} thrown in /customers/0/3/2/reineckeimmobilien.de/httpd.www/wp/wp-includes/widgets.php on line 113