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