Fatal error: Uncaught Error: Class "Elementor\Widget_Base" not found in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Platform/WordPress/Integration/Elementor/ElementorWidgetSmartSlider350.php:11 Stack trace: #0 {main} thrown in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Platform/WordPress/Integration/Elementor/ElementorWidgetSmartSlider350.php on line 11