Fatal error: Uncaught Error: Class 'WP_Widget' not found in /home/legarden/www/app/plugins/nextend-smart-slider3-pro/Nextend/SmartSlider3/Platform/WordPress/Widget/WidgetSmartSlider3.php:13 Stack trace: #0 {main} thrown in /home/legarden/www/app/plugins/nextend-smart-slider3-pro/Nextend/SmartSlider3/Platform/WordPress/Widget/WidgetSmartSlider3.php on line 13